RESUMEN
AIM: The aim of this retrospective study is to evaluate and compare the 3-dimensional (3D) crown sizes of the left and right sides of upper and lower dental arches in patients with unilateral cleft lip and palate (UCLP). MATERIALS AND METHODS: Dental casts of 94 patients all in permanent dentition were included in this study. Dental casts were divided into three groups as 36 casts with unilateral left cleft lip and palate (ULCLP), 18 casts with unilateral right cleft lip and palate (URCLP), and 40 casts without cleft (control). Mesiodistal (MD), buccolingual (BL), and gingiva incisal (GI) values of each tooth were measured by scanning the dental models with a high-precision optical 3D scanner. Paired t-test and independent t-test were used for statistical analysis. RESULTS: U1 MD, U6 MD (P = 0.001) and BL (P = 0.01), L3 GI (P = 0.05) were greater in UCLP patients on the non-cleft side while U1 GI, L1 BL, L5 MD (P = 0.001), L4 MD, and BL (P = 0.01) values were found to be greater on the cleft side. Comparison of the cleft-sides and the control group showed that MD, BL, and GI dimensions of teeth on the cleft sides were generally found to be smaller, excluding the UR7 GI values for URCLP group (P = 0.05). CONCLUSION: In the measurements of teeth size, reliable and repeatable results were acquired through 3D software. Tooth size asymmetries can occur non-syndromic UCLP patients in both jaws. MD, BL, and GI dimensions of teeth are mostly found to be smaller in patients with CLP.
Asunto(s)
Labio Leporino , Imagenología Tridimensional/métodos , Odontometría/métodos , Corona del Diente/diagnóstico por imagen , Estudios de Casos y Controles , Niño , Fisura del Paladar/patología , Oclusión Dental , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador/métodos , Masculino , Maxilar , Estudios Retrospectivos , Corona del Diente/patologíaRESUMEN
BACKGROUND: The incidence and potential risk factors for the recurrence of benign nodular goitre after unilateral thyroidectomy are not clearly defined. The aim of this study was to assess the rate of progression of nodular goitre in the contralateral thyroid lobe and of hypothyroidism requiring replacement therapy after unilateral thyroid lobectomy for benign nodular goitre. PATIENTS AND METHODS: Patients who underwent hemithyroidectomy for benign nodular goitre between 2000 and 2009 were included in the study. The primary outcome of this study was the reoperation rate for recurrent goitre, the rate of progression of nodular goitre and the rate of hypothyroidism requiring L-T4 replacement therapy. Clinical factors that have an effect on progression were further analysed. RESULTS: 259 patients were included for study. Progression of the nodular goitre in the remnant lobe was observed in 32% (n = 83) of the patients. However, over time, only 2% of these 83 patients underwent contralateral hemithyroidectomy due to this progression. Fifty-six (22%) patients required L-thyroxin replacement due to persistent hypothyroidism after hemithyroidectomy. The factors shown to affect progression of nodular goitre were advanced age, preoperative hyperthyroidism, preoperative diagnosis of toxic nodular goitre and the presence of surgical indication for a toxic goitre causing hyperthyroidism and a definitive pathological diagnosis of nodular hyperplasia. CONCLUSION: There was a progression of the nodular goitre in the remnant lobe in about one-third of the patients who underwent hemithyroidectomy. However, only 2% of these patients underwent complementary contralateral hemithyroidectomy due to clinical progression in 31 months of follow-up.
Asunto(s)
Manejo de la Enfermedad , Bocio Nodular/cirugía , Tiroidectomía/métodos , Femenino , Estudios de Seguimiento , Bocio Nodular/diagnóstico , Humanos , Masculino , Persona de Mediana Edad , Recurrencia , Reoperación , Estudios Retrospectivos , Factores de Riesgo , Resultado del TratamientoRESUMEN
INTRODUCTION: Despite numerous studies investigating the dimensional and therapeutic effects of mandibular advancement splints (MASs), data regarding the effects of differently designed individual and non-adjustable MASs on the upper airway in fully dentate apneic subjects in the sagittal plane including comparison of these effects with a placebo device are sparse. The present study aimed to determine the dimensional changes in the sagittal plane created by differently designed MASs in the upper airway in fully dentate apneic subjects and to compare these changes with the effects of a placebo device. MATERIALS AND METHODS: Magnetic resonance (MR) images of 9 dentate apneic subjects with 5 differently designed MASs and without a MAS were obtained. We measured the area of the entire pharynx (velopharynx, oropharynx, hypopharynx) on these MR images and compared the dimensional changes. RESULTS: The dimensional changes triggered by two specific MASs (75% of the maximum mandibular protrusion with 5 mm vertical opening, and 75% of the maximum mandibular protrusion with 10 mm of vertical opening) in the entire pharynx in the sagittal plane were statistically significant compared to the other MASs (p < 0.05). The MAS effecting 75% of the maximum mandibular protrusion and 10 mm of vertical opening created a significant dimensional increase only in the velopharyngeal area among the three pharyngeal sites (p ≤ 0.003). CONCLUSION: While the degree of mandibular protrusion created by the MAS affects the dimensions of the upper airway, the degree of the vertical opening exerts no significant dimensional effect in the sagittal plane in fully dentate apneic patients. The mandibular protrusion effect is comparatively larger in the velopharyngeal region.
Asunto(s)
Imagen por Resonancia Magnética/métodos , Mandíbula/patología , Avance Mandibular/métodos , Faringe/patología , Apnea Obstructiva del Sueño/patología , Apnea Obstructiva del Sueño/prevención & control , Adulto , Femenino , Humanos , Interpretación de Imagen Asistida por Computador/métodos , Masculino , Avance Mandibular/instrumentación , Persona de Mediana Edad , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Resultado del TratamientoRESUMEN
The aims of this study were to evaluate volumetric changes in the nasal cavity (NC) and pharyngeal airway space (PAS) after Le Fort I maxillary distraction osteogenesis (MDO) using a three-dimensional (3D) simulation program, and to determine the effects of MDO on respiratory function during sleep with polysomnography (PSG). 3D computed tomography images were obtained and analyzed before surgery (T0) and at a mean 8.2 ± 1.2 months postsurgery (T1) (SimPlant-OMS software) for 11 male patients (mean age 25.3 ± 5.9 years) with severe skeletal class III anomalies related to maxillary retrognathia. The simulation of osteotomies and placement of distractors were performed on stereolithographic 3D models. NC and PAS were segmented separately on these models for comparison of changes between T0 and T1. PSG including the apnoea-hypopnoea index (AHI), sleep efficiency, sleep stages (weakness, stages 1-4, and rapid eye movement (REM)), and mean lowest arterial O2 saturation were obtained at T0 and T1 to investigate changes in respiratory function during sleep. MDO was successful in all cases as planned on the models; the average forward movement at A point was 10.2mm. Increases in NC and PAS volume after MDO were statistically significant. These increases resulted in significant improvement in sleep quality. PSG parameters changed after MDO; AHI and sleep stages weakness, 1, and 2 decreased, whereas REM, stages 3 and 4, sleep efficiency, and mean O2 saturation increased.
Asunto(s)
Imagenología Tridimensional , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/cirugía , Cavidad Nasal/diagnóstico por imagen , Osteogénesis por Distracción/métodos , Osteotomía Le Fort , Faringe/diagnóstico por imagen , Tomografía Computarizada por Rayos X , Adolescente , Adulto , Humanos , Masculino , Polisomnografía , Resultado del TratamientoRESUMEN
OBJECTIVES: To evaluate the heating and magnetic field interactions of fixed orthodontic appliances with different wires and ligaments in a 3-T MRI environment and to estimate the safety of these orthodontic materials. METHODS: 40 non-carious extracted human maxillary teeth were embedded in polyvinyl chloride boxes, and orthodontic brackets were bonded. Nickel-titanium and stainless steel arch wires, and elastic and stainless steel ligaments were used to obtain four experimental groups in total. Specimens were evaluated at 3 T for radiofrequency heating and magnetic field interactions. Radiofrequency heating was evaluated by placing specimens in a cylindrical plastic container filled with isotonic solution and measuring changes in temperature after T1 weighted axial sequencing and after completion of all sequences. Translational attraction and torque values of specimens were also evaluated. One-way ANOVA test was used to compare continuous variables of temperature change. Significance was set at p < 0.05. RESULTS: None of the groups exhibited excessive heating (highest temperature change: <3.04 °C), with the maximum increase in temperature observed at the end of the T1 weighted axial sequence. Magnetic field interactions changed depending on the material used. Although the brackets presented minor interactions that would not cause movement in situ, nickel-titanium and stainless steel wires presented great interactions that may pose a risk for the patient. CONCLUSIONS: The temperature changes of the specimens were considered to be within acceptable ranges. With regard to magnetic field interactions, brackets can be considered "MR safe"; however, it would be safe to replace the wires before MRI.
Asunto(s)
Imagen por Resonancia Magnética/métodos , Soportes Ortodóncicos , Alambres para Ortodoncia , Aleaciones Dentales/efectos de la radiación , Elastómeros/efectos de la radiación , Calor , Humanos , Soluciones Isotónicas , Campos Magnéticos , Ensayo de Materiales , Níquel/efectos de la radiación , Ondas de Radio , Seguridad , Acero Inoxidable/efectos de la radiación , Temperatura , Termómetros/clasificación , Titanio/efectos de la radiación , TorqueRESUMEN
Bimaxillary orthognathic surgery (BOS) is commonly used in the correction of severe Class III deformities (mandibular prognathism with maxillary retrognathism). The postural response of the pharyngeal airway after mandibular setback and maxillary advancement procedures is clinically crucial for maintaining optimum respiration. Patients might suffer from obstructive sleep apnoea, postoperatively. The aim of this study was to determine the effects of BOS on pharyngeal airway space, respiratory function during sleep and pulmonary functions. 21 male patients were analysed using cephalometry, spirometry for pulmonary function tests, and a 1 night sleep study for full polysomnography before and 17±5 months after BOS. The data show that the hyoid bone repositioned to the inferior, the tongue and soft palate displaced to the posterior, narrowed at the oropharynx and hypopharynx and widened at the nasopharynx and velopharynx levels significantly (p<0.05). The alterations indicated decreased airway resistance and better airflow. As a consequence of polysomnography evaluation, the sleep quality and efficiency of the patients improved significantly after BOS. Patients who undergo BOS should be monitored with pulmonary function tests and polysomnography pre- and postoperatively to detect any airway obstruction.
Asunto(s)
Pulmón/fisiopatología , Mandíbula/cirugía , Maxilar/cirugía , Procedimientos Quirúrgicos Ortognáticos/métodos , Faringe/patología , Respiración , Sueño/fisiología , Resistencia de las Vías Respiratorias/fisiología , Cefalometría/métodos , Estudios de Seguimiento , Cabeza/anatomía & histología , Humanos , Hueso Hioides/patología , Hipofaringe/patología , Masculino , Maloclusión de Angle Clase III/cirugía , Nasofaringe/patología , Orofaringe/patología , Osteotomía Le Fort/métodos , Osteotomía Sagital de Rama Mandibular/métodos , Paladar Blando/patología , Polisomnografía , Postura , Prognatismo/cirugía , Ventilación Pulmonar/fisiología , Pruebas de Función Respiratoria , Espirometría/métodos , Lengua/patología , Adulto JovenRESUMEN
UNLABELLED: Oxygen radicals and radicals derived from nitrogen metabolism are important in wound and anostomotic healing. In particular, nitrous oxide, originating from induced nitrous oxide synthetase, retards the wound healing process by producing peroxynitride. Therefore induced nitric oxide synthase (INOS) inhibitors and peroxynitride cleansing agents seem helpful in promoting healing. The purpose of this study was to investigate the effects of N-acetylcysteine (antioxidant), ebselen (peroxynitride cleansing agent) and 1400w (INOS inhibitor) on experimental colonic anastomotic wound healing. MATERIAL AND METHODS: 45 randomized Sprague-Dawley rats received colonic anastomosis, and all animals were treated for four days with drugs specific for each group except for the sham and control groups. All rats were given a relaparatomy on the fifth day of the study and evaluated for study parameters indicating anastomotic healing, burst pressure, tissue malondialdehit (MDA), superoxide dismutase (SOD), glutathione peroxidase (GPx) and hydroxyproline (OH-proline). RESULTS: when compared to the control group, increased (p < 0.01) burst pressure, OH-proline and decreased MDA, and SOD levels were noted in the 1400w group. Furthermore, the GPx levels were higher (p < 0.05) in rats given NAC therapy. CONCLUSIONS: the positive results of selective INOS inhibition using 1400w in this study confirm the adverse effects of the INOS enzyme on anastomotic wound healing. Therefore, we have concluded that 1400w may be helpful in promoting anastomotic healing.
Asunto(s)
Acetilcisteína/uso terapéutico , Amidinas/uso terapéutico , Azoles/uso terapéutico , Bencilaminas/uso terapéutico , Colon/cirugía , Depuradores de Radicales Libres/uso terapéutico , Óxido Nítrico Sintasa/antagonistas & inhibidores , Compuestos de Organoselenio/uso terapéutico , Estrés Oxidativo/efectos de los fármacos , Cicatrización de Heridas/efectos de los fármacos , Anastomosis Quirúrgica , Animales , Isoindoles , Ratas , Ratas Sprague-Dawley , Cicatrización de Heridas/fisiologíaRESUMEN
OBJECTIVE: The aim of this study was to evaluate the effects of local resveratrol (RSVL) administration on bone formation in response to expansion of the inter-premaxillary suture, in rats. MATERIAL AND METHODS: Twenty 50- to 60-day-old male Wistar rats were separated into two equal groups. Both groups were subjected to expansion, and 30 cN of force was applied to the maxillary incisors with helical-spring. Twenty-four hours after appliance placement, single-dose 10 µmol/kg RSVL in the dimethylsulfoxide (DMSO) was injected to the inter-premaxillary suture in the experimental group. In the control group, the same amount of DMSO was injected to the suture of rats. Bone formation in the suture was evaluated histomorphometrically. The area of new bone (µm(2)), the perimeter around the new bone (µm), Feret's diameter (µm), the percentage of new bone to non-ossified tissue (%), and the number of osteoblast were measured and compared. Mann-Whitney U-test was used for statistical evaluation at p < 0.05 level. RESULTS: Statistically significant differences were found between the groups for all histomorphometric parameters. New bone area (p < 0.001), bone perimeter (p < 0.001), Feret's diameter (p < 0.001), percentage of new bone (p < 0.001), and the number of osteoblast (p < 0.001) were significantly larger in the experimental group when compared with the control. Bone histomorphometric measurements revealed that bone architecture in the RSVL treated rats was improved. CONCLUSIONS: Local application of RSVL during the early stages to orthopedically expanded inter-premaxillary suture area may stimulate bone formation and shorten the retention period, in rats.
Asunto(s)
Antioxidantes/farmacología , Suturas Craneales/efectos de los fármacos , Maxilar/efectos de los fármacos , Osteogénesis/efectos de los fármacos , Técnica de Expansión Palatina , Estilbenos/farmacología , Animales , Recuento de Células , Dimetilsulfóxido , Portadores de Fármacos , Masculino , Alambres para Ortodoncia , Osteoblastos/efectos de los fármacos , Técnica de Expansión Palatina/instrumentación , Hueso Paladar/efectos de los fármacos , Ratas , Ratas Wistar , Resveratrol , Solventes , Factores de TiempoRESUMEN
Solitary rectal ulcer syndrome (SRUS) is a traumatic lesion of the anterior or circular rectal wall caused by straining due to functional disorders of defecation. Defecography, transrectal ultrasonography or anorectal manometry are suitable procedures that may be used to detect the causative disorder and should, therefore, be performed in patients with solitary rectal ulcer syndrome. Histopathological features of SRUS are characteristic and pathognomonic, nevertheless the endoscopic and clinical presentations may be confusing. The lesions may mimic other rectal pathologies and lead to wrong diagnosis. We retrospectively evaluated 34 patients with SRUS who had various treatments. Rectosigmoidoscopy, defecography, transrectal ultrasonography and anorectal manometry were performed for evaluation of cases. The operative management was rectopexy in 26 patients, rectal mucosectomy in 4 patients, segmental colonic resection in 2 patients, local excision in 1 patient and colostomy in 1 patient. Total regression and healing of the ulcer occurred in 32 of 34 patients. Partial regression of symptoms in 2 patients, who underwent rectopexy and rectal mucosectomy, occurred, but we could not get complete healing.
Asunto(s)
Enfermedades del Recto/patología , Úlcera/patología , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Enfermedades del Recto/etiología , Enfermedades del Recto/terapia , Estudios Retrospectivos , Síndrome , Úlcera/etiología , Úlcera/terapiaRESUMEN
OBJECTIVE: To evaluate aortic function and its relation to left ventricular diastolic function in patients with hypertension, diabetes, or both, without coronary artery disease. METHODS: Study groups were composed of 27 healthy participants and 25 patients with hypertension, 24 with diabetes, and 18 with hypertension and diabetes. Coronary artery disease was excluded in all of the study participants. Aortic strain and distensibility were calculated from the aortic diameters measured by echocardiography and blood pressure obtained by sphygmomanometry. RESULTS: There were significant differences between the control and the patient groups (hypertensive, diabetic, and diabetic-hypertensive) in aortic strain (mean (SD) 18 (8)% v 11 (7)%, 9 (3)%, and 8 (3)%, respectively, p < 0.001) and distensibility (10 (5.1) v 3.1 (1.5), 5.1 (2.8), and 2 (0.9) cm2/dyn/10(3), respectively, p < 0.001). In a multivariate analysis, the parameter most closely related to the deceleration time in the control group was aortic distensibility (standardised beta coefficient -0.50, p = 0.002, overall R2 = 0.25). In the patient group, the parameter most closely related to deceleration time was also aortic distensibility (standardised beta coefficient -0.36, p = 0.009, overall R2 = 0.13). Even though the study group variable was entered in to the multivariate model, aortic distensibility was found to be the parameter most closely related to deceleration time (standardised beta coefficient -0.48, p < 0.001, overall R2 = 0.22). CONCLUSION: Aortic stiffness is increased in patients with hypertension, diabetes, or both even after the exclusion of coronary artery disease. Aortic stiffness and left ventricular diastolic dysfunction are also associated in these patients.
Asunto(s)
Aorta Torácica/fisiopatología , Diabetes Mellitus Tipo 2/fisiopatología , Angiopatías Diabéticas/fisiopatología , Hipertensión/fisiopatología , Disfunción Ventricular Izquierda/fisiopatología , Diástole , Ecocardiografía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Variaciones Dependientes del Observador , Reproducibilidad de los Resultados , Resistencia Vascular/fisiologíaRESUMEN
OBJECTIVE: Since there is a difficulty in the assessment of right ventricular systolic function by 2D echocardiography, a noninvasive, practical and, cost effective method is desirable. Tissue Doppler technique enables to visualize systolic and diastolic velocities of the tissue through sample volume replacement. In this study, we aimed to evaluate the relationship between tricuspid annular tissue Doppler velocities and right ventricular systolic functions. METHODS: For this purpose, tricuspid annular systolic (S), early diastolic (E) and, late diastolic (A) velocities were obtained from 38 patients (23 with dilated cardiomyopathy, 15 with mitral stenosis, all of them in sinus rhythm) and 15 healthy control subjects by placing the pulsed wave sample volume at the junction of right ventricular free wall and tricuspid annulus. The time velocity integral (TVI) of S, peak velocity of S and isovolumic contraction time (IVCT) were compared with right ventricular ejection fraction (RVEF) determined by 2D echocardiographic hemi-elliptic shell model, peak velocity of tricuspid regurgitation and dP/dt calculated from the spectral trace of this regurgitation. RESULTS: A significant correlation was determined between RVEF and peak S velocity, S TVI and IVCT (r: 0.76, p < 0.001, r: 0.82, p < 0.0001 and r: -0.85, p < 0.0001 respectively). The peak S velocity < 12 cm/sec, S TVI < 2 cm and IVCT > 75 msec yielded 76%, 84%, 92% sensitivity and 84%, 84%, 80% specificity for predicting the patients with right ventricular ejection fraction < 40%, respectively. A significant and powerful correlation was determined between the peak S velocities and dP/dt in 19 patients whose tricuspid regurgitation could be clearly recorded (r: 0.88, p < 0.0001). CONCLUSIONS: The analysis of tricuspid annular velocities obtained by tissue Doppler technique is a practical method of the assessment of right ventricular systolic functions.
Asunto(s)
Válvula Tricúspide/diagnóstico por imagen , Ultrasonografía Doppler de Pulso , Disfunción Ventricular Derecha/diagnóstico por imagen , Adulto , Cardiomiopatía Dilatada/diagnóstico por imagen , Cardiomiopatía Dilatada/fisiopatología , Estudios de Casos y Controles , Femenino , Pruebas de Función Cardíaca , Humanos , Masculino , Persona de Mediana Edad , Estenosis de la Válvula Mitral/diagnóstico por imagen , Estenosis de la Válvula Mitral/fisiopatología , Valor Predictivo de las Pruebas , Sensibilidad y Especificidad , Volumen Sistólico/fisiología , Sístole , Ultrasonografía Doppler de Pulso/normasRESUMEN
Although intravenous fluid therapy may be lifesaving if it is given properly, faulty application and inadequate care with this modality of treatment may lead to various complications. Many of these complications can be prevented by conducting the procedure in accordance with a standard protocol and with adequate care and monitoring. The aim of this study was to develop a protocol for intravenous fluid therapy and to determine whether the nurses observed the protocol. The study was done with 37 nurses working in a coronary care unit. The data were collected on a "Nurse Observation Form," and statistical evaluation, percentage, and the Cochran Q significance test were used. By the third observation, a higher percentage of nurses performed the procedures correctly, which indicated that implementation of the protocol had a positive effect.
Asunto(s)
Fluidoterapia/enfermería , Infusiones Intravenosas/enfermería , Protocolos Clínicos , Fluidoterapia/métodos , Fluidoterapia/normas , Humanos , Infusiones Intravenosas/métodos , Infusiones Intravenosas/normasRESUMEN
One of the most common causes of phlebitis in hospitalized patients is intravenous catheters. The material of the catheter is a determining factor in the development of phlebitis, as are factors such as age, gender, and medical diagnosis of the patient. The aim of this study, conducted in the coronary care unit of a 384-bed hospital in Ankara, Turkey, was to determine the effect of two different short peripheral catheters on phlebitis development caused by i.v. treatment. Overall, 255 patients constituted the study sample (130 with Teflon, 125 with Vialon catheters). Both groups were followed up for phlebitis development for 6 days. The total phlebitis rate was 36.8%, with almost half of the patients (49.2%) in the Teflon catheter group and 24.0% of patients in the Vialon catheter group. A significant statistical relationship was found between phlebitis rate and variables such as gender, catheter material, and indwelling time. The results of the study demonstrate that Vialon catheters are associated with less risk of catheter-induced phlebitis than are Teflon catheters.
Asunto(s)
Cateterismo Periférico/instrumentación , Infección Hospitalaria/prevención & control , Profesionales para Control de Infecciones , Flebitis/prevención & control , Adulto , Anciano , Cateterismo Periférico/efectos adversos , Cateterismo Periférico/enfermería , Infección Hospitalaria/epidemiología , Femenino , Anciano Frágil , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Flebitis/epidemiología , Politetrafluoroetileno , PoliuretanosRESUMEN
Although liver resection has been shown to prolong survival in selected patients with metastases from colorectal cancer, the benefit for other metastatic tumors is unproved. To determine whether hepatic resection has a role in the management of metastatic leiomyosarcoma, medical records from 11 consecutive patients who underwent resection of isolated metastases from leiomyosarcoma between 1984 and 1995 were reviewed. All liver resections were for leiomyosarcomas originating in the viscera (n = 6) or retroperitoneum (n = 5). The average disease-free interval was 16 months. Five of 11 primary tumors were classified as low grade, whereas six were high grade. Hepatic resections included lobectomy or extended lobectomy (n = 4), segmentectomy and/or wedge resection (n = 5), and complex resection (n = 2). There were no operative deaths. Median survival of all patients after liver resection was 39 months. Patients who underwent complete resection of hepatic metastases (n = 6) had a significantly longer survival than those who had incomplete resections (n = 5) (P = 0.03, log-rank test). Furthermore, five of six patients who underwent complete resection are alive after hepatectomy with a median follow-up of 53 months. Therefore, in selected patients with isolated liver metastases from visceral and retroperitoneal leiomyosarcomas, complete resection of hepatic metastases results in prolonged survival.