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PURPOSE: A readily available artificial urinary conduit might be substituted for autologous bowel in standard urinary diversions and minimize bowel associated complications. However, the use of large constructs remains challenging as host cellular ingrowth and/or vascularization is limited. We investigated large, reinforced, collagen based tubular constructs in a urinary diversion porcine model and compared subcutaneously pre-implanted constructs to cell seeded and basic constructs. MATERIALS AND METHODS: Reinforced tubular constructs were prepared from type I collagen and biodegradable Vicryl® meshes through standard freezing, lyophilization and cross-linking techniques. Artificial urinary conduits were created in 17 female Landrace pigs, including 7 with a basic untreated construct, 5 with a construct seeded with autologous urothelial and smooth muscle cells, and 5 with a free graft formed by subcutaneous pre-implantation of a basic construct. All pigs were evaluated after 1 month. RESULTS: The survival rate was 94%. At evaluation 1 basic and 1 cell seeded conduit were occluded. Urinary flow was maintained in all conduits created with pre-implanted constructs. Pre-implantation of the basic construct resulted in a vascularized tissue tube, which could be used as a free graft to create an artificial conduit. The outcome was favorable compared to that of the other conduits. Urinary drainage was better, hydroureteronephrosis was limited and tissue regeneration was improved. CONCLUSIONS: Subcutaneous pre-implantation of a basic reinforced tubular construct resulted in a vascularized autologous tube, which may potentially replace bowel in standard urinary diversions. To our knowledge we introduce a straightforward 2-step procedure to create artificial urinary conduits in a large animal model.

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Reconstruction of long ureteral defects often warrants the use of graft tissue and extensive surgical procedures to maintain the safe transport of urine from the kidneys to the urinary bladder. Complication risks, graft failure-related morbidity, and the lack of suitable tissue are major concerns. Tissue engineering might offer an alternative treatment approach in these cases, but ureteral tissue engineering is still an underreported topic in current literature. In this review, the most recent published data regarding ureteral tissue engineering are presented and evaluated, with a focus on cell sources, implantation strategies, and (bio)materials.

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PURPOSE: We systematically reviewed preclinical studies in the literature to evaluate the potential of tissue engineering of the bladder. Study outcomes were compared to the available clinical evidence to assess the feasibility of tissue engineering for future clinical use. MATERIALS AND METHODS: Preclinical studies of tissue engineering for bladder augmentation were identified through a systematic search of PubMed and Embase™ from January 1, 1980 to January 1, 2014. Primary studies in English were included if bladder reconstruction after partial cystectomy was performed using a tissue engineered biomaterial in any animal species, with cystometric bladder capacity as an outcome measure. Outcomes were compared to clinical studies available at http://www.clinicaltrials.gov and published clinical studies. RESULTS: A total of 28 preclinical studies are included, demonstrating remarkable heterogeneity in study characteristics and design. Studies in which preoperative bladder volumes were compared to postoperative volumes were considered the most clinically relevant (18 studies). Bladder augmentation through tissue engineering resulted in a normal bladder volume in healthy animals, with the influence of a cellular component being negligible. Furthermore, experiments in large animal models (pigs and dogs) approximated the desired bladder volume more accurately than in smaller species. The initial clinical experience was based on seemingly predictive healthy animal models with a promising outcome. Unfortunately these results were not substantiated in all clinical trials, revealing dissimilar outcomes in different clinical/disease backgrounds. Thus, the translational predictability of a model using healthy animals might be questioned. CONCLUSIONS: Through this systematic approach we present an unbiased overview of all published preclinical studies investigating the effect of bladder tissue engineering on cystometric bladder capacity. Preclinical research in healthy animals appears to show the feasibility of bladder augmentation by tissue engineering. However, in view of the disappointing clinical results based on healthy animal models new approaches should also be evaluated in preclinical models using dysfunctional/diseased bladders. This endeavor may aid in the development of clinically applicable tissue engineered bladder augmentation with satisfactory long-term outcome.

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In the field of regenerative medicine, various types of biodegradable and nonbiodegradable scaffolds have been developed for urinary tract tissue-engineering applications. Naturally derived or synthetic materials have been tested to determine their properties and their effectiveness. However, the majority of the current literature focuses on the reconstruction of the urethra, urinary diversion, and urinary bladder, while limited data have been published regarding the use of biomaterials in ureteral reconstruction. Tissue engineering might offer alternative and less invasive therapeutic options for long ureteral defects compared with the current surgical reconstructive techniques and their potential complications. In this article, we aimed to review the literature regarding ureteral tissue engineering through a Medline search and describe new potential options for future clinical applications. We concluded that the available literature is inconclusive since the superiority of a specific scaffold has not been demonstrated and the latest developments of regenerative medicine have not been evaluated in ureteral tissue engineering yet.

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Our objective was to compare the effect of tamsulosin versus transurethral resection of the prostate (TURP) for the management of nocturia in previously untreated men with lower urinary tract symptoms (LUTS) suggestive of benign prostatic hyperplasia (BPH) and no other predisposing factors for nocturia. The study group included 66 patients (mean age 68.9 years, range 52-81) randomized to receive either tamsulosin 0.4 mg per os daily (n = 33) or TURP (n = 33). Nocturia was assessed at baseline, after 3 months and after 1 year, by the number of nocturnal awakenings and hours of undisturbed sleep (HUS) obtained from a 72-h Frequency Volume Chart (FVC). Furthermore, the International Prostate Symptom Score (IPSS), the International Consultation on Incontinence Questionnaire Nocturia (ICIQ-N) and the International Consultation on Incontinence Questionnaire Nocturia Quality of Life (ICIQ-NQoL) were recorded. At baseline, there were no statistically significant differences between the two groups. ICIQNQoL and ICIQ-N scores correlated with the number of awakenings and HUS, respectively. Both tamsulosin and TURP improved all examined parameters during the follow up. TURP was associated with a statistically significant improvement in the number of nocturnal awakenings and in the IPSS, ICIQ-N and ICIQ-NQol scores in comparison with tamsulosin. HUS increased in both groups, but without any statistically significant difference. In conclusion, TURP is superior in comparison with tamsulosin for the management of BPH-related nocturia.

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INTRODUCTION: Changes in collagen metabolism have been postulated to play a pivotal role in the pathogenesis of Peyronie's Disease (PD). Androgens such as dehydroepiandrosterone sulfate (DHEA-S) and testosterone influence collagen metabolism by modulating the activity of matrix metalloproteases (MMP) and tissue inhibitors of metalloproteases (TIMP). AIM: The aim of this study was to evaluate the interrelationship between androgens (DHEA-S and testosterone), key regulators of collagen metabolism such as insulin-like growth factor (IGF) 1 and IGF Binding Protein 3 (IGF-BP3), the MMP/TIMP system, and PD. METHODS: Age matched PD patients (14) and healthy men (10) who acted as controls were recruited. Blood samples were collected from all subjects in the early morning hours after an overnight fast. MAIN OUTCOME MEASURES: Serum levels of testosterone, sex hormone binding globulin, DHEA-S, 3-α-androstanediol glucuronide, pro-MMP-1, MMP-1, MMP-2, TIMP-1, TIMP-2, IGF-1 and IGF-BP3 were measured in both groups. Statistical methods included univariate, bivariate, and multivariate regression models. RESULTS: Levels of DHEA-S (114.5 vs. 169.5 µg/dL; p = 0.03), IGF-BP3 (2.96 vs. 3.79 µg/mL; p = 0.01), and TIMP-1 (173.1 vs. 195 ng/mL; p = 0.01) were significantly lower in PD patients. In contrast, the level of TIMP-2 (102 vs. 85 ng/mL; p = 0.001) was significantly lower in the control group. Using stepwise regression analysis, only TIMP-2 (p < 0.001) and DHEA-S (p = 0.04) were significantly related to PD in the final model (R(2) = 0.63). TIMP-1 and DHEA-S (r = 0.55, p < 0.05) were positively correlated in the PD group, whereas IGF-1 and testosterone (r = -0.54, p < 0.05), and IGF-BP3 and testosterone (r = -0.68, p < 0.05) were negatively correlated in PD patients. CONCLUSIONS: Our findings suggest that decreased levels of adrenal androgens may be implicated in the pathogenesis of PD. The mechanism and clinical relevance of this observation remain to be established.

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INTRODUCTION: A burned-out seminoma of the testis is an exceptionally rare clinical entity, with few reports found in the literature. CASE PRESENTATION: A case of burned-out tumor of the testis in a 31-year-old man is reported. The tumor presented as a retroperitoneal mass with histological characteristic of a seminoma. The testes on clinical examination were normal, and a suspicious lesion in the scrotum was only identified after ultrasound. Incision of the abdominal mass was decided, followed by orchectomy. Histological examination of the testis revealed a suspicious lesion with characteristics of spontaneous regression of germ cell tumors. CONCLUSION: We describe one of very few cases worldwide, where spontaneous regression of a primary testicular tumor occurred after demonstration of retroperitoneal lymph node metastasis, a phenomenon known as burned-out seminoma, which is hard to recognize and incompletely characterized by physicians.

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INTRODUCTION: Subcutaneous emphysema of the scrotum due to traumatic pneumothorax is a rare medical situation and only a few cases are reported in the literature. CASE REPORT: We present the case of a 22 year old man who was admitted to the emergency department after a motorcycle accident having a painless crepitant scrotum and chest excoriations. Further evaluation revealed subcutaneous emphysema of the scrotum caused by left pneumothorax. CONCLUSION: In conclusion, subcutaneous emphysema of the scrotum (or pneumoscrotum) due to traumatic pneumothorax is not an urgent condition and assessment should be supportive with intervention directed at the etiology, e.g. the pneumothorax.

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INTRODUCTION: Rapture of a renal angiomyolipoma and massive retroperitoneal hemorrhage, during pregnancy is rare and occasionally fatal. The association of this complication with pregnancy has been reported sporadically in the literature. CASE PRESENTATION: We report a case of a 28 years old woman, in 33 week of her first pregnancy who came to our hospital complaining of abdominal pain in the right hemiabdomen, associated with nausea and vomiting. The ultrasound and MRI (Magnetic resonance imaging) scan showed a 7 x 7 x 5 cm mass suggestive of angiomyolipoma in the right kidney, with evidence of retroperitoneal bleeding right perirenal and intrarenal haematoma. Given the size of the tumor, presence of symptoms and hemodynamic instability of the patient right nephrectomy was performed, following emergency caesarean delivery. The histological study of the resected mass revealed the presence of angiomyolipoma. CONCLUSION: In conclusion, it seems that these tumours show a greater growth index in pregnant women. Angiomyolipoma with spontaneous bleeding during pregnancy is a dangerous condition that may cause mortality in the mother and fetus, but elective, simultaneous cesarean section and radical nephrectomy can be performed. We have also done a review of the literature focusing on its management and its relationship with pregnancy.