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By harnessing structural hierarchical insights, plausibly simulate better ones imagination to figure out the best choice of methods for reaching out the unprecedented developments of the tissue engineering products as a next level. Constructing a functional tissue that incorporates two-dimensional (2D) or higher dimensions requires overcoming technological or biological limitations in order to orchestrate the structural compilation of one-dimensional and 2D sheets (microstructures) simultaneously (in situ). This approach enables the creation of a layered structure that can be referred to as an ensemble of layers or, after several days of maturation, a direct or indirect joining of layers. Here, we have avoided providing a detailed methodological description of three-dimensional and 2D strategies, except for a few interesting examples that highlight the higher alignment of cells and emphasize rarely remembered facts associated with vascular, peripheral nerve, muscle, and intestine tissues. The effective directionality of cells in conjunction with geometric cues (in the range of micrometers) is well known to affect a variety of cell behaviors. The curvature of a cell's environment is one of the factors that influence the formation of patterns within tissues. The text will cover cell types containing some level of stemness, which will be followed by their consequences for tissue formation. Other important considerations pertain to cytoskeleton traction forces, cell organelle positioning, and cell migration. An overview of cell alignment along with several pivotal molecular and cellular level concepts, such as mechanotransduction, chirality, and curvature of structure effects on cell alignments will be presented. The mechanotransduction term will be used here in the context of the sensing capability that cells show as a result of force-induced changes either at the conformational or the organizational levels, a capability that allows us to modify cell fate by triggering downstream signaling pathways. A discussion of the cells' cytoskeleton and of the stress fibers involvement in altering the cell's circumferential constitution behavior (alignment) based on exposed scaffold radius will be provided. Curvatures with size similarities in the range of cell sizes cause the cell's behavior to act as if it was in an in vivo tissue environment. The revision of the literature, patents, and clinical trials performed for the present study shows that there is a clear need for translational research through the implementation of clinical trial platforms that address the tissue engineering possibilities raised in the current revision. This article is categorized under: Infectious Diseases > Biomedical Engineering Neurological Diseases > Biomedical Engineering Cardiovascular Diseases > Biomedical Engineering.

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Introduction: Epithelioid hemangioendothelioma is a rare vascular tumor with an epithelioid and histiocytoid appearance. Intestinal intussusception can manifest as chronic abdominal pain, representing only 1-5% of intestinal obstructions in adults. Case report: 65-year-old female who is attended with chronic abdominal pain. We performed a computed tomography showing the incursion of the ileum into the right colon. She was taken to the operating table, with the finding of ileo-colic intestinal intussusception due to small bowel tumor, with subsequent anatomopathological results of epithelioid hemangioendothelioma. Conclusions: The diagnosis and management process with an appropriate postoperative outcome is described.

Introducción: El hemangioendotelioma epitelioide es un tumor vascular poco frecuente de aspecto epitelioide e histiocitoide. La intususcepción intestinal suele ser causa de dolor abdominal crónico y corresponde al 1-5% de las obstrucciones intestinales en el adulto. Caso clínico: Mujer de 65 años que acude con dolor abdominal crónico. Se realiza tomografía computarizada y se observa incursión del íleon en el colon derecho. Es llevada a mesa operatoria con hallazgo de intususcepción intestinal ileocólica por tumoración de intestino delgado, con resultado anatomopatológico de hemangioendotelioma epitelioide. Conclusiones: Se describe el proceso de diagnóstico y manejo, con apropiado desenlace posoperatorio.

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Introducción. El angiosarcoma es una neoplasia vascular originada a nivel del endotelio, de baja frecuencia, conocido por su agresividad y crecimiento acelerado. Alcanza solo el 1 al 2 % del total de los sarcomas. La presentación gastrointestinal es infrecuente y su incidencia es poco conocida debido al escaso reporte de casos en la literatura. Suele identificarse en etapas avanzadas debido a la dificultad del diagnóstico histopatológico por sus características morfológicas, siendo necesario aplicar tinciones especiales o estudio inmunohistoquímico. Caso clínico. Por su interés y singularidad, presentamos el caso de un paciente masculino de 54 años, quien consultó con hemorragia digestiva profusa, anemización y requerimiento de terapia transfusional. Resultados. Durante el proceso diagnóstico, en la endoscopia encontraron diversas lesiones multifocales que se extendían por gran parte del tracto gastrointestinal. El estudio histopatológico mostró angiosarcoma gastrointestinal. Discusión. El angiosarcoma del tracto gastrointestinal es extremadamente infrecuente, de difícil diagnóstico y bajas posibilidades de manejo curativo, con opciones terapéuticas limitadas, lo que configura un mal pronóstico a corto plazo

Introduction. Angiosarcoma is a vascular neoplasm originating from endothelial cells, known for its aggressiveness, accelerated growth and reduced frequency. Reach only 1 to 2% of total sarcomas. Gastrointestinal presentation is extremely rare, the true incidence is poorly known, due to the limited reports of this entity in the literature. It is usually identified in advanced stages in view of the difficulty of the histopathological diagnosis, attributable to its morphological characteristics, being necessary to apply special stains or immunohistochemical study. Case report. Due to their interest and uniqueness, we present the case of a 54-year-old male patient, who presented with a profuse gastrointestinal bleeding, anemia, and requirement for transfusion therapy. Results. The endoscopy detected several multifocal lesions that extended most of the gastrointestinal tract. The histopathological study showed gastrointestinal angiosarcoma. Discussion. Angiosarcoma of the gastrointestinal tract is extremely uncommon, difficult to diagnose and has low possibilities of curative management, with limited therapeutic options, which configures a poor prognosis in the short term

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BACKGROUND: The transplantation of tissues is a developing practice. Improving cryopreservation techniques and emerging of new immunobiology concepts have let to establish the transplant of vascular allografts as a suitable alternative. This study aims to expose the Catalan experience in vascular allograft transplantation by disclosing basic data about clinical outcomes. MATERIALS AND METHODS: Data about vascular allografts transplants was gathered from the Registry of Vascular and Valvular Transplantation of Catalonia, Spain. Basic data regards to clinical outcomes are presented. Kaplan-Meier and statistical analysis were performed using SPSS Ver. 20 for Mac (Chicago USA). RESULTS: One hundred and seventy-one adults were transplanted. The overall 5-year SR was 51.5%. Survival (SR) differs with the territory revascularized, ranging from 37.5% to 55.6% at five years. Major adverse limb event-free rate ranges from 13.3% to 50.1% according to the area treated. The Primary patency rate is higher in the supra-inguinal revascularization and lowers when a distal vessel target is treated. CONCLUSION: Only one guideline-supported indication is currently done for allografts, and our results match with this indication. Our results are extensive and susceptible to analysis to address future projects, which are required to reconsider new or specific indications. More studies are needed to clarify the outcomes of arterial allografts.

ANTECEDENTES: El trasplante de tejido es una practica clínica en crecimiento. Las mejoras en técnicas de criopreservación y los nuevos conceptos sobre inmunobiología ha permitido que el trasplante vascular sea una alternativa a considerar. Este estudio expone la experiencia catalana en trasplante de tejido vascular mediante la exposición de datos clínicos. MATERIALES AND MÉTODOS: Los datos sobre trasplantes de aloinjertos vasculares se obtuvieron del Registro de trasplantes vasculares y valvulares de Cataluña, España (ReVAC). Se presentan datos básicos relacionados con los resultados clínicos. Kaplan Meier y el análisis estadístico se realizó con SPSS Ver. 20 para Mac (Chicago EE. UU.). RESULTADOS: 171 adultos fueron trasplantados. La supervivencia a 5 años fue del 51,5%. La supervivencia (SR) difiere con el territorio revascularizado, oscilando entre el 37,5% y el 55,6% a los cinco años. La tasa de sujetos libres de evento mayor en la extremidad (MALE-Free Rate) oscila entre el 13,3% y el 50,1% según la zona tratada. La tasa de permeabilidad primaria es mayor en la revascularización supra-inguinal y menor cuando se trata un vaso diana distal. CONCLUSIÓN: En la actualidad, solo hay una indicación de trasplante de aloinjertos respaldada por las guías clínicas y nuestros resultados coinciden con esta indicación. Nuestros resultados son amplios y susceptibles de análisis para abordar proyectos futuros que se requieren para reconsiderar indicaciones nuevas o específicas. Se necesitan más estudios para aclarar los resultados de los aloinjertos arteriales.

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El hemangioma cavernoso es una neoplasia benigna de los vasos sanguíneos. Este trabajo tuvo como objetivo presentar el caso de un hemangioma cavernoso gigante que fue tratado con propranolol. El diagnóstico se realizó mediante examen físico, dúplex y otros complementarios de interés. Para la decisión de la conducta terapéutica, especialistas de diferentes especialidades evaluaron al paciente: Oncología, Dermatología, Ortopedia, Pediatría y Angiología. Una vez establecido el tratamiento, se realizó un seguimiento durante cuatro semanas y luego mensual. El resultado, después de 22 meses, fue la desaparición del hemangioma. El propranolol en el hemangioma cavernoso gigante debe ser el tratamiento de elección precoz para una evolución satisfactoria y evitar complicaciones(AU)

Cavernous hemangioma is a benign neoplasm of blood vessels. This work aimed at presenting the case of a giant cavernous hemangioma treated with propranolol. The diagnosis was made by physical examination, duplex Doppler sonography, and complementary tests of interest. For deciding the therapeutic approach, the patient was assessed by several specialists from different medical fields, such as oncology, dermatology, orthopedics, pediatrics, and angiology. Once the treatment was established, a follow-up was carried out for four weeks and then monthly. The outcome, after twenty-two months, was the hemangioma disappearance. Propranolol in giant cavernous hemangioma should be the treatment of early choice for a satisfactory evolution and to avoid complications(AU)

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Splenic vascular neoplasms are the most common form of spleen tumors. Among them, littoral cell angioma is rare and it is frequently an incidental finding in imaging studies. It has no specific clinical, laboratory or imaging findings. Splenectomy allows definitive diagnosis throughout a histopathological examination. We report a 52-year-old man presenting with asthenia and abdominal distension. Computed tomography with intravenous contrast showed multiple splenic hypodense masses and a prostatic enlargement. Presuming a lymphoma, a laparoscopic splenectomy was performed. Histopathologic examination diagnosed littoral cell angioma. During urological follow-up, a prostate adenocarcinoma was diagnosed.

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Introdução: O hemangioendotelioma cutâneo kaposiforme (HEK) é um tumor vascular raro localmente agressivo, visto principalmente em recém-nascidos e crianças. Tem prevalência de 0,91 casos por 100.000 crianças, mais comum nas extremidades. O tratamento de escolha é a ressecção total, todavia muitas vezes não é possível devido à extensão da lesão e associação ao fenômeno de Kasabach-Merritt. Objetivos: Descrever a evolução de caso raro de tumor na região plantar de criança, correlacionando os achados radiológicos, cirúrgicos e histopatológicos. Métodos: Os autores relatam o caso de menino admitido aos cinco anos de idade com lesão cutânea plantar dolorosa recidivada. No exame de ressonância magnética (RMN) apresentava lesão na região plantar posterior medindo 3cmx2cm, superficial à fáscia plantar, no exame de biópsia revelou hemangioendotelioma kaposiforme, sem associação com o fenômeno de Kasabach- Merritt. Foi submetido a procedimento cirúrgico para exérese, apresentou recidiva após seis meses. Foi realizada nova ressecção ampla, reconstrução com retalho plantar e enxerto de pele parcial, obtendo-se margens livres, sem recidiva no seguimento de 15 anos. Conclusão: Os achados clínicos sugeriam fibromatose plantar, a RMN auxiliou na delimitação do tumor, o exame histopatológico com imunohistoquímica confirmaram o diagnóstico de hemangioendotelioma cutâneo kaposiforme. Realizou-se ressecção até a fáscia com recidiva, sendo necessária reabordagem e ressecção até o periósteo com a reconstrução com retalho plantar e enxerto de pele, sem recidiva no seguimento de 15 anos. Os autores chamam a atenção para a ressecção ampla de margens profundas e laterais para controle do crescimento tumoral.

Introduction: Kaposiform cutaneous hemangioendothelioma (HEK) is a rare locally aggressive vascular tumor, seen mainly in newborns and children. It has a prevalence of 0.91 cases per 100,000 children, being most common in the extremities. The treatment of choice is total resection; however, it is often not possible due to the lesion's extent and association with the Kasabach-Merritt phenomenon. Objectives: To describe the evolution of a rare tumor in the plantar region of a child, correlating the radiological, surgical, and histopathological findings. Methods: The authors report the case of a boy admitted at the age of five with a recurrent painful plantar skin lesion. In the magnetic resonance examination (NMR), he presented a lesion in the posterior plantar region measuring 3cmx2cm, superficial to the plantar fascia. In the biopsy examination, he revealed kaposiform hemangioendothelioma without association with the Kasabach-Merritt phenomenon. He underwent a surgical procedure for excision and presented recurrence after six months. A new broad resection, reconstruction with a plantar flap, and partial skin graft were performed, obtaining free margins, with no recurrence in the 15-year follow-up. Conclusion: Clinical findings suggested plantar fibromatosis, NMR helped in delimiting the tumor, and histopathological examination with immunohistochemistry confirmed the diagnosis of kaposiform cutaneous hemangioendothelioma. Resection was performed up to the fascia with recurrence, requiring re-approach and resection to the periosteum with reconstruction using a plantar flap and skin graft, without recurrence after 15 years. The authors call attention to the wide resection of deep and lateral margins to control tumor growth.

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Glomus tumor (GT) is a benign mesenchymal tumor with an estimated incidence of 1.5 to 2% of soft tissue tumors. The majority of glomus tumors are benign and are mostly seen in the superficial skin & soft tissue of upper and lower distal extremity. The malignant variant of the glomus tumor is scarce. We report a case of a recurrent glomus tumor diagnosed in a 28-year-old male patient, who complained of painful swelling in the proximal phalanx of the right index finger. The magnetic resonance imaging of the hand revealed a well-defined multilobulated soft tissue mass at the palmar aspect of the 2nd digit along the shaft of the proximal phalanx. Histopathology revealed a well-circumscribed tumor arranged in solid sheets, nests and cords interconnect by vessels of varying size. The tumor cells were round to oval, showed moderate nuclear pleomorphism, eosinophilic cytoplasm, atypical mitoses (>5/10HPF), and necrosis. Immunohistochemically tumor cells reveal diffuse and strong cytoplasmic positivity with smooth muscle actin (SMA). Based on histomorphology and immunohistochemistry, a final diagnosis of malignant glomus tumor was made. We report this case due to its rarity, and it to be included among the differential if the lesion is painful and recurrent.

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Abstract Multinucleate cell angiohistiocytoma is a rare, benign vascular proliferation of unknown etiology. It occurs mainly in middle-aged women and usually affects the acral regions; the lesions appear as discrete, grouped, and asymptomatic violaceous papules. Histopathology shows proliferation and dilated small vessels in the papillary dermis, fibrous stroma with thickened collagen bundles, and multinucleated giant cells. To date, there are approximately 140 cases described in the indexed literature. This report presents the case of a 62-year-old woman with a typical clinical condition, who chose not undergo treatment, considering the benign character of her illness. The clinical and immunohistological aspects of this unusual dermatological entity are emphasized.

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Multinucleate cell angiohistiocytoma is a rare, benign vascular proliferation of unknown etiology. It occurs mainly in middle-aged women and usually affects the acral regions; the lesions appear as discrete, grouped, and asymptomatic violaceous papules. Histopathology shows proliferation and dilated small vessels in the papillary dermis, fibrous stroma with thickened collagen bundles, and multinucleated giant cells. To date, there are approximately 140 cases described in the indexed literature. This report presents the case of a 62-year-old woman with a typical clinical condition, who chose not undergo treatment, considering the benign character of her illness. The clinical and immunohistological aspects of this unusual dermatological entity are emphasized.

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Papillary intralymphatic angioendothelioma (Dabska tumor) is a rarely metastasizing lymphatic vascular neoplasm that usually affects children and young adults. The majority of these cases occur in soft tissues of extremities, and to date less than 40 cases have been described. Despite the generally indolent evolution, can be locally invasive with the potential to metastasize. We describe a case of a young woman presenting with a plantar lesion, for 9 months and histological diagnosis of Dabska tumor. This neoplasm should be considered in the differential diagnosis of vascular dermatoses, allowing early diagnosis and treatment. Long-term follow-up should be performed.

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Introdução: O lábio é a região do corpo mais frequentemente acometida por anomalias vasculares (AV). A correta determinação da etiologia da lesão é determinante à escolha do tratamento do paciente e à correta condução do caso. O objetivo deste estudo é correlacionar o posicionamento anatômico e as características das lesões com o diagnóstico etiológico das AVs dos lábios, a fim de promover uma ferramenta que auxilie na prática clínica. Métodos: Análise retrospectiva de 150 pacientes com AV dos lábios, avaliados entre 1999 e 2017. O diagnóstico etiológico foi baseado na classificação de ISSVA 2014. Análise clínica e fotográfica foi realizada para avaliar o padrão anatômico de envolvimento e mapear as lesões. Resultados: Hemangioma infantil apresentou acometimento de apenas um lábio, em menor extensão e situado mais centralmente, com raro envolvimento de comissura oral. Malformações venosas e venolinfáticas (MVs) e malformações arteriovenosas (MAVs) envolveram o lábio superior predominantemente, situadas mais lateralmente e acarretando significativa deformidade. Contudo, MAVs apresentaram mais frequente extensão além dos limites do vermelhão. Os pacientes com malformações capilares (MCs) sofriam de acometimento integral do lábio inferior. Todos os casos de malformações linfáticas exclusivas (MLs) envolveram o lábio superior inteiro, com grande distorção. Conclusão: A apresentação inicial das AVs muitas vezes consiste em pequenas alterações, desafiadoras ao diagnóstico assertivo. Padrões específicos de acometimentos foram observados para cada diagnóstico etiológico estudado. O mapeamento pode ser utilizado como ferramenta auxiliar diagnóstica e contribuir para melhor intervenção nos pacientes com anomalias vasculares labiais.

Introduction: The lip is the body region more often affected by vascular anomalies (VAs). Identifying the appropriate etiology of the lesion is significantly important when determining the treatment of choice for the patient. This study aimed to determine the association between the anatomical positioning and the characteristics of the lesions and the etiological diagnosis of VAs of the lips to identify the appropriate tool to be used in clinical practice. Methods: A retrospective analysis was performed in 150 patients with VA of the lips evaluated between 1999 and 2017. The etiological diagnosis was based on the International Society for the Study of Vascular Anomalies 2014 classification. Clinical and photographic analysis was performed to assess the anatomical pattern of involvement and map the lesions. Results: An infantile hemangioma was observed to a lesser extent in only one lip and was situated more centrally, with rare involvement of the labial commissure. Venous and venous-lymphatic malformations and arteriovenous malformations (AVMs) involving the upper lip were predominantly located more laterally and caused significant deformity. However, AVMs more often extended beyond the limits of the vermilion. Capillary malformations were observed in the entire lower lip in some patients. Simple lymphatic malformations were observed in the entire upper lip with significant distortion in some patients. Conclusion: The initial presentation of VAs often comprises minimal changes; hence, establishing an assertive diagnosis is considered difficult. Specific patterns of involvement were observed for each etiological diagnosis studied. Anatomical mapping can be used as an auxiliary diagnostic tool and can possibly identify an appropriate clinical intervention in patients with VAs of the lip.

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Abstract Papillary intralymphatic angioendothelioma (Dabska tumor) is a rarely metastasizing lymphatic vascular neoplasm that usually affects children and young adults. The majority of these cases occur in soft tissues of extremities, and to date less than 40 cases have been described. Despite the generally indolent evolution, can be locally invasive with the potential to metastasize. We describe a case of a young woman presenting with a plantar lesion, for 9 months and histological diagnosis of Dabska tumor. This neoplasm should be considered in the differential diagnosis of vascular dermatoses, allowing early diagnosis and treatment. Long-term follow-up should be performed.

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Cardiovascular disease is the most common cause of death in the world. In severe cases, replacement or revascularization using vascular grafts are the treatment options. While several synthetic vascular grafts are clinically used with common approval for medium to large-caliber vessels, autologous vascular grafts are the only options clinically approved for small-caliber revascularizations. Autologous grafts have, however, some limitations in quantity and quality, and cause an invasiveness to patients when harvested. Therefore, the development of small-caliber synthetic vascular grafts (<5 mm) has been urged. Since small-caliber synthetic grafts made from the same materials as middle and large-caliber grafts have poor patency rates due to thrombus formation and intimal hyperplasia within the graft, newly innovative methodologies with vascular tissue engineering such as electrospinning, decellularization, lyophilization, and 3D printing, and novel polymers have been developed. This review article represents topics on the methodologies used in the development of scaffold-based vascular grafts and the polymers used in vitro and in vivo.

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Introducción. Las malformaciones vasculares son anomalías que están presentes desde el nacimiento, no desaparecen y pueden crecer a lo largo de la vida. Se ha demostrado en estudios retrospectivos que la terminología para clasificar las anomalías vasculares es inexacta en un 69 % de casos, por lo que se hace un diagnostico inadecuado y en un 53 % de casos se brinda al paciente y su familia una información incorrecta del tratamiento y el curso clínico. Métodos. Estudio prospectivo longitudinal, realizado entre 2016 y 2019, donde se incluyeron pacientes con anomalías vasculares, que consultaron a nuestra institución, fueron valorados por el servicio de cirugía vascular, se hizo un plan diagnóstico y manejo integral, vía endovascular, quirúrgica o mixta, de acuerdo con cada caso. Resultados. La malformación más común fue la de tipo venoso, en el 40,3 % de los casos. Se realizó manejo endovascular en el 93,1 % de casos de malformaciones vasculares y quirúrgico en el 6,9 %. La mejoría de los síntomas que motivaron la consulta fue del 100 % para los tumores vasculares y del 70,8 % para las malformaciones. Sin embargo, los resultados son heterogéneos. Discusión. Es necesario realizar un adecuado diagnóstico de las anomalías vasculares, para alcanzar un trata-miento eficaz, con mejoría de los síntomas

Introduction. Vascular malformations are abnormalities that are present from birth, do not disappear and can grow throughout life. It has been shown in retrospective studies that the terminology to classify vascular anomalies is inaccurate in 69% of cases, an inappropriate diagnosis is made and in 53% of cases the patient and their family are given incorrect information on the treatment and the clinical course.Methods. Longitudinal prospective study conducted between 2016 and 2019. Patients with vascular anomalies and consulted to our institution were included. They were evaluated by the vascular surgery service, and a comprehensive diagnosis and management plan was made, including endovascular, surgical or mixed, according to each case. Results. The most common malformation was the venous type in 40.3% of the cases. Endovascular management was performed in 93.1% of cases and surgery in 6.9%. The improvement in the symptoms that led to the con-sultation was 100% for vascular tumors and 70.8% for malformations. However, the results are heterogeneous.Conclusions. It is necessary to obtain an adequate diagnosis of vascular anomalies, to achieve an effective treatment, with improvement of the symptoms

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Glomus tumor (GT) is a benign mesenchymal tumor with an estimated incidence of 1.5 to 2% of soft tissue tumors. The majority of glomus tumors are benign and are mostly seen in the superficial skin & soft tissue of upper and lower distal extremity. The malignant variant of the glomus tumor is scarce. We report a case of a recurrent glomus tumor diagnosed in a 28-year-old male patient, who complained of painful swelling in the proximal phalanx of the right index finger. The magnetic resonance imaging of the hand revealed a well-defined multilobulated soft tissue mass at the palmar aspect of the 2nd digit along the shaft of the proximal phalanx. Histopathology revealed a well-circumscribed tumor arranged in solid sheets, nests and cords interconnect by vessels of varying size. The tumor cells were round to oval, showed moderate nuclear pleomorphism, eosinophilic cytoplasm, atypical mitoses (>5/10HPF), and necrosis. Immunohistochemically tumor cells reveal diffuse and strong cytoplasmic positivity with smooth muscle actin (SMA). Based on histomorphology and immunohistochemistry, a final diagnosis of malignant glomus tumor was made. We report this case due to its rarity, and it to be included among the differential if the lesion is painful and recurrent.

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Introdução: O couro cabeludo é uma área de difícil reconstrução devido à sua pouca elasticidade e por sobrepor-se a uma estrutura rígida e convexa. Existem diferentes técnicas cirúrgicas para reparação dos defeitos, que podem ser produto de diversas etiologias, como: traumas, deformidades e consequência de doenças, principalmente oncológicas, como é o caso do paciente apresentada neste trabalho. O angiossarcoma cutâneo é um tumor vascular maligno raro e extremamente agressivo, que afeta principalmente idosos. É caracterizado clinicamente pelo aparecimento de placas eritêmato-violáceas e de rápida evolução. O tratamento depende da extensão da doença. A maioria dos casos são tratados com ampla ressecção cirúrgica e reconstrução. O objetivo é relatar um caso de reconstrução de grande defeito do couro cabeludo depois de uma dissecção oncológica, realizado no Hospital Central do Exército (HCE) - RJ. Métodos: O caso foi tratado com enxerto autólogo e uso de matriz dérmica, em 2 tempos cirúrgicos, até a total cobertura da área lesionada. Resultados: Obteve-se resultado satisfatório após as cirurgias de enxertia de pele na área ressecada. Conclusão: O enxerto autólogo, juntamente a matriz dérmica mostrou-se uma opção viável na reconstrução do couro cabeludo.

Introduction: It is difficult to reconstruct the scalp due to its poor elasticity and presence of layers over a rigid convex structure. Different surgical techniques are used to repair defects that may develop due to several etiologies, such as trauma, deformities, and disease sequelae, especially cancer, as noted in the present case. Cutaneous angiosarcoma, a rare and extremely aggressive malignant vascular tumor that mainly develops in elderly individuals, is clinically characterized by the onset of rapidly evolving erythematous purple plaques. The treatment depends on disease extent. Most patients are treated with wide surgical resection and reconstruction. The objective is to report a case of reconstruction of a major scalp defect after an oncologic dissection performed at the Hospital Central do Exército in Rio de Janeiro. Methods: An autologous graft and dermal matrices were applied during two surgical periods till the damaged area was fully covered. Results: Satisfactory results were obtained after performing skin grafting surgery in the resected area. Conclusion: The autologous graft and dermal matrix proved to be a viable option for scalp reconstruction.

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Coronary artery and peripheral vascular diseases are the leading cause of morbidity and mortality worldwide and often require surgical intervention to replace damaged blood vessels, including the use of vascular patches in endarterectomy procedures. Tissue engineering approaches can be used to obtain biocompatible and biodegradable materials directed to this application. In this work, dense or porous scaffolds constituted of chitosan (Ch) complexed with alginate (A) or pectin (P) were fabricated and characterized considering their application as tissue-engineered vascular patches. Scaffolds fabricated with alginate presented higher culture medium uptake capacity (up to 17 g/g) than materials produced with pectin. A degradation study of the patches in the presence of lysozyme showed longer-term stability for Ch-P-based scaffolds. Pectin-containing matrices presented higher elastic modulus (around 280 kPa) and ability to withstand larger deformations. Moreover, these materials demonstrated better performance when tested for hemocompatibility, with lower levels of platelet adhesion and activation. Human smooth muscle cells (HSMC) adhered, spread and proliferated better on matrices produced with pectin, probably as a consequence of cell response to higher stiffness of this material. Thus, the outcomes of this study demonstrate that Ch-P-based scaffolds present superior characteristics for the application as vascular patches. Despite polysaccharides are yet underrated in this field, this work shows that biocompatible tridimensional structures based on these polymers present high potential to be applied for the reconstruction and regeneration of vascular tissues.

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Abstract: Acquired elastotic hemangioma is a hemangioma variant first described in 2002. It is characterized by being a benign, solitary, slow-growing lesion, that appears in adulthood and is associated with solar exposure. It is a rare hemangioma variant with few cases reported in the literature. We present a case of acquired elastotic hemangioma on the back of the right hand and forearm in a male adult. Acquired elastotic hemangioma is a benign vascular proliferation associated with solar exposure, usually assymptomatic. It affects adults between 59 and 65 years of age. Histopatologically it is characterized by proliferation of small vessels in the upper dermis that are disposed parallel to the epidermis, and significant solar elastosis. The treatment is surgical, with no relapses reported.

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