RESUMEN

Histological tumor subtyping, staging, and grading are of utmost importance to stratify patients with bladder cancer for treatment and should be as precise as possible. In the presented study, we investigated the prognostic impact of standard clinicopathological parameters in cystectomy patients and compared embedding of the entire bladder with standard partial embedding via a virtual superimposed approach. The study included 121 cystectomy specimens, which were completely embedded. Clinical and histopathological data of patients were obtained (median follow-up 21.5 months; range 1-67 months). For 88 patients two-dimensional tumor maps (macrophotographs and histology-based maps) were prepared, and embedding of the entire bladder was compared with a virtual standard partial embedding, created by a virtual overlay and data extraction of the tumor maps. Kaplan-Meier plots, Cox regression estimators, Chi-square, and McNemar tests were used. In a multivariate Cox regression model for overall survival, only venous invasion (p = 0.008, HR = 3.35, 95 % CI 1.375-8.161) and organ-confined (pTis-pT2) versus non-organ-confined diseases (pT3-pT4; p = 0.021, HR 2.669, 95 % CI 1.157-6.159) were found significant. Advanced versus standard embedding revealed significant improvement in the detection of carcinoma in situ (50 versus 61, p = 0.003) and lymphatic invasion (18 versus 24, p = 0.041), but no significant advantage in the detection of tumor stage, tumor multifocality, or venous invasion (all p > 0.05). TNM classification, including lymphatic and venous invasion, is of utmost importance to stratify patients with advanced invasive bladder cancer. Histopathological details are detected more reliably by whole organ embedding, but this approach showed no significant benefit in terms of outcome-related parameters (max. tumor stage, venous invasion) in our cohort.

Asunto(s)

RESUMEN

Metabolic components like fatty acids and acyl-Coenzyme A (acyl-CoA) thioesters have been implicated in the pathogenesis of various tumours. The activation of fatty acids to acyl-CoAs is catalysed by long chain acyl-CoA synthetases (ACSLs), and impairment of ACSL expression levels has been associated with tumourigenesis and progression. Since ACSLs have never been investigated in bladder tissues, the study aims to characterize ACSL expression and acyl-CoA synthesis in normal and neoplastic bladder tissues, as well as cell lines. ACSL isoforms 1, 3, 4 and 5 and synthesis of acyl-CoAs were analysed using qRT-PCR, western blot analysis, immunohistochemistry and lipid mass spectrometry. In normal urothelium, expression of ACSL1, 3, 4 and 5, with highest levels of ACSL isoform 5 was found. However, ACSL5 expression was reduced in corresponding neoplastic tissues and urothelial cell lines depending on the grade of cellular differentiation. Anti-ACSL5 immunostainings showed expression in normal urothelium and a gradual loss of ACSL5 protein via pre-invasive lesions to invasive carcinomas. High expression of ACSL5 correlated with increased α-galactosidase activity and positive Uroplakin III staining in tumours. In contrast, synthesis of acyl-CoAs was enhanced in neoplastic bladder tissues compared to normal urothelium, and reflected an increase with respect to cellular differentiation. These results confirm an expression of ACSLs, especially isoform 5, in human urothelium, prove enzymatic/lipidomic changes in bladder cancer tissues, and suggest an involvement of ACSL5 in cellular maturation and/or senescence with possible effects onto induction of tumour formation or progression. Further work may identify responsible pathway alterations, and attempting to re-balance the metabolic equilibrium of the urothelium may offer a further opportunity for tumour treatment and prevention.

Asunto(s)

RESUMEN

UNLABELLED: Study Type - Therapy (case series) Level of Evidence 4 What's known on the subject? and What does the study add? In this study we observed courses of micturition symptoms and differentiated degrees of symptoms for each point in time while also considering the impact of bothersomeness. Our data show that not only significantly more patients who have undergone BT suffer from OAB than those who have undergone RP, but also that those affected show significantly higher values for severity of OAB symptoms throughout the whole observation period of 36 months. Our data analysis further shows that variability of OAB symptoms as well as fluctuation of severity of OAB symptoms vary to a significantly higher degree after BT than after RP. Looking only at mean figures at a given point in time clearly underestimates the underlying problem. This fact is not reflected in the literature. OBJECTIVE: • To look at individual courses of postoperative micturition symptoms, especially urgency, in patients treated either with radical prostatectomy (RP) or with brachytherapy (BT). PATIENTS AND METHODS: • In a prospective longitudinal study we investigated individual changes in micturition symptoms before treatment, and 6, 12, 24 and 36 months after treatment. • All patients received the European Organization for the Research and Treatment of Cancer quality-of-life questionnaire, QLQ-C30, and the International Continence Society male questionnaire at each assessment. • We looked at long-term results as well as changes in time using repeated measures analysis of variance. We further analysed fluctuation of symptoms using sum of changes. RESULTS: • Of the 389 patients treated consecutively in our clinic over the last few years, 99 patients with a mean (sd) age of 65 (6.3) years had completed all five questionnaires and thus were further analysed. Of these, 66 (66.7%) were treated with RP and 33 (33.3%) with BT. • With the exception of age, no significant difference was found between the treatment groups either in physical functioning or in prevalence and severity of overactive bladder (OAB) symptoms. • Adjusted for age and pretreatment symptoms in analysis of covariance, we found that there were statistically more symptoms of OAB 36 months after BT compared with those patients treated with RP (P < 0.025). Whereas 30% of patients complained about severe symptoms of urgency after BT, only 11% did so after RP. • Changes of severity of OAB symptoms over the course of time (P < 0.007) using analysis of repeated measures as well as variability of OAB symptoms (P < 0.033) using the two-sided Wilcoxon t-test were significantly higher in patients treated with BT than in patients treated with RP. CONCLUSIONS: • Independently of age and physical functioning, BT is significantly associated with higher rates of long-term urgency symptoms, even after 3 years. • Repeated measurements show that OAB symptoms are highly fluctuating and that in patients treated with BT, severity of symptoms as well as variability of symptoms was significantly higher than in those patients treated with RP. • Persistent OAB seems to be an underestimated problem after treatment for localized prostate cancer, especially in patients treated with BT.

Asunto(s)

RESUMEN

The location of stem cells in the epithelium of the prostatic acinus remains uncertain, as does the cellular origin of prostatic neoplasia. Here, we apply lineage tracing to visualize the clonal progeny of stem cells in benign and malignant human prostates and understand the clonal architecture of this epithelium. Cells deficient for the mitochondrially-encoded enzyme cytochrome c oxidase (CCO) were identified in 27 frozen prostatectomy specimens using dual colour enzyme histochemistry and individual CCO-normal and -deficient cell areas were laser-capture microdissected. PCR-sequencing of the entire mitochondrial genome (mtDNA) of cells from CCO-deficient areas found to share mtDNA mutations not present in adjacent CCO-normal cells, thus proving a clonal origin. Immunohistochemistry was performed to visualize the three cell lineages normally present in the prostatic epithelium. Entire CCO-deficient acini, and part-deficient acini were found. Deficient patches spanned either basal or luminal cells, but sometimes also both epithelial cell types in normal, hyperplastic or atrophic epithelium, and prostatic intraepithelial neoplasia (PIN). Patches comprising both PIN and invasive cancer were observed. Each cell area within a CCO-deficient patch contained an identical mtDNA mutation, defining the patch as a clonal unit. CCO-deficient patches in benign epithelium contained basal, luminal and endocrine cells, demonstrating multilineage differentiation and therefore the presence of a stem cell. Our results demonstrate that the normal, atrophic, hypertrophic and atypical (PIN) epithelium of human prostate contains stem cell-derived clonal units that actively replenish the epithelium during ageing. These deficient areas usually included the basal compartment indicating the basal layer as the location of the stem cell. Importantly, single clonal units comprised both PIN and invasive cancer, supporting PIN as the pre-invasive lesion for prostate cancer.

Asunto(s)

RESUMEN

Little is known about the clonal architecture of human urothelium. It is likely that urothelial stem cells reside within the basal epithelial layer, yet lineage tracing from a single stem cell as a means to show the presence of a urothelial stem cell has never been performed. Here, we identify clonally related cell areas within human bladder mucosa in order to visualize epithelial fields maintained by a single founder/stem cell. Sixteen frozen cystectomy specimens were serially sectioned. Patches of cells deficient for the mitochondrially encoded enzyme cytochrome c oxidase (CCO) were identified using dual-colour enzyme histochemistry. To show that these patches represent clonal proliferations, small CCO-proficient and -deficient areas were individually laser-capture microdissected and the entire mitochondrial genome (mtDNA) in each area was PCR amplified and sequenced to identify mtDNA mutations. Immunohistochemistry was performed for the different cell layers of the urothelium and adjacent mesenchyme. CCO-deficient patches could be observed in normal urothelium of all cystectomy specimens. The two-dimensional length of these negative patches varied from 2-3 cells (about 30 µm) to 4.7 mm. Each cell area within a CCO-deficient patch contained an identical somatic mtDNA mutation, indicating that the patch was a clonal unit. Patches contained all the mature cell differentiation stages present in the urothelium, suggesting the presence of a stem cell. Our results demonstrate that the normal mucosa of human bladder contains stem cell-derived clonal units that actively replenish the urothelium during ageing. The size of the clonal unit attributable to each stem cell was broadly distributed, suggesting replacement of one stem cell clone by another.

Asunto(s)

RESUMEN

A solitary fibrous tumor of the kidney is a rare neoplasm that was often misdiagnosed as hemangiopericytoma, until recently. We report a case of a 35-year-old male patient with a solid, 7 cm tumor located centrally in a solitary right kidney. The patient underwent successful bench surgery and autotransplantation.

Asunto(s)

RESUMEN

BACKGROUND: Interpretation of comparative health-related quality of life (HRQOL) studies following different prostate cancer treatments is often difficult due to differing patient ages. Furthermore, age-related changes can hardly be discriminated from therapy-related changes. The evaluation of age-and comorbidity-related changes was in focus of this study. METHODS: HRQOL of 528 prostate cancer patients was analysed using a validated questionnaire (Expanded Prostate Cancer Index Composite) before a curative treatment. Patients were divided into age groups 75 years. The impact of specific comorbidities and the Charlson Comorbidity Index (CCI) were evaluated. The questionnaire comprises 50 items concerning the urinary, bowel, sexual and hormonal domains for function and bother. For assessment of sexual and hormonal domains, only patients without prior hormonal treatment were included (n = 336). RESULTS: Urinary incontinence was observed increasingly with higher age (mean function scores of 92/88/85/87 for patients 75 years) complete urinary control in 78%/72%/64%/58% (p < 0.01). Sexual function scores decreased particularly (48/43/35/30), with erections sufficient for intercourse in 68%/50%/36%/32% (p < 0.01) a decrease of more than a third comparing patients 75 years; p < 0.05). A multivariate analysis revealed an independent influence of both age and comorbidities on urinary incontinence, specifically diabetes on urinary bother, and both age and diabetes on sexual function/bother. Rectal domain scores were not significantly influenced by age or comorbidities. A CCI>5 particularly predisposed for lower urinary and sexual HRQOL scores. CONCLUSION: Urinary continence and sexual function are the crucial HRQOL domains with age-related and independently comorbidity-related decreasing scores. The results need to be considered for the interpretation of comparative studies or longitudinal changes after a curative treatment.

Asunto(s)

RESUMEN

Modern LDR brachytherapy has drastically reduced rectal toxicity and decreased the occurrence of rectourethral fistulas to <0.5% of patients. Therefore, symptoms of late-onset sequelae are often ignored initially. These fistulas cause severe patient morbidity and require interdisciplinary treatment. We report on the occurrence and management of a rectourethral fistula which occurred 4 years after (125)I seed implantation.

Asunto(s)

RESUMEN

OBJECTIVE: To compare the efficacy of two types of botulinum toxin type A (BTX-A; Dysport, Ipsen Ltd, Slough, UK) or Botox (Allergan Inc., Irvine, CA, USA) and examine the possible dose-effect relation for Dysport in those patients, as multifocal detrusor injections with BTX-A are effective for severe neurogenic detrusor overactivity in adults. PATIENTS AND METHODS: This was an open-label, observational case-control study comparing Dysport and Botox, and the dose-effect relation for Dysport. The patients included were treated with either Dysport (cases; 500, 750, or 1000 IU), or with Botox (controls: 300 IU, and exceptionally 200 or 400 IU). The continence volume (primary), mean and maximum catheterized volume, and antimuscarinic use were assessed, and cystometric variables measured were overactivity volume (primary), detrusor compliance, and cystometric capacity. All variables were assessed at baseline, 3 and 9 months after treatment, and results analysed using analysis of variance (paired) t-tests, chi-square tests and regression analysis. RESULTS: There were 28 cases and 28 matched controls; their demographic characteristics, bladder management, and baseline values were comparable between the groups. At 3 months there was a significant improvement in cystometric variables and continence volume in both groups, but in mean catheterized volume and reduced use of antimuscarinics in cases only. At 9 months there was no significant improvement over baseline except for the continence volume in the cases. There were no significant differences in results between the groups except for the continence volume at 3 months (459 mL after Dysport and 396 mL after Botox; P=0.015). There was no dose-related response for Dysport at 3.8 months of follow-up. The interval between injections (9.5, 14.5 and 16.1 months for Dysport 500, 750, and 1000 IU; 10.1 months for Botox) was not significant. There were nine non-responders in the Dysport group and seven in the Botox group; the patient characteristics and baseline data were comparable to those of the responders. There was transient hypoasthenia in one of the responders (750 IU Dysport). CONCLUSIONS: A single treatment session with either Dysport or Botox in a setting combined with antimuscarinics might improve the patient's condition for up to a year. There was no clear dose-related effect for Dysport in adults.

Asunto(s)

RESUMEN

BACKGROUND: Despite continuing research for accurate bladder cancer biomarkers, the analytes suffer from lack of sensitivity and specificity. OBJECTIVE: To search for discriminating protein patterns in serum, we used magnetic bead-based separation followed by matrix-assisted laser desorption ionization (MALDI) time-of-flight (TOF) mass spectrometry (MS) to identify patients with bladder cancer. DESIGN, SETTING AND PARTICIPANTS: In total, serum samples from 105 patients with bladder cancer, 98 healthy controls, and 45 prostate cancer patients were included in this study. MEASUREMENTS: Serum samples were fractionated by means of surface-activated magnetic beads and were subsequently analyzed with MALDI-TOF MS. Multidimensional data analysis was done to generate algorithms capable of distinguishing between cancer patients and healthy individuals. The algorithms were trained using a training set of 41 bladder cancer patients and 39 healthy controls and were validated with an independent test set of 64 bladder cancer patients and 59 healthy controls. Additionally, 45 prostate cancer samples were used as a third test set. RESULTS AND LIMITATIONS: In the training set, patients with bladder cancer could be identified with an overall sensitivity of 94.1% and specificity of 89.2%. Similar results could be achieved for the test set, showing 96.4% sensitivity and 86.5% specificity. Even the presence of low-stage tumors could be predicted with 96% sensitivity and could be distinguished from higher stage or grade tumors with a sensitivity of 77.3%. Distinction between other tumor stages, however, resulted in lower sensitivity values. CONCLUSIONS: These findings demonstrate that screening for serum protein patterns using MALDI-TOF MS shows high sensitivity and specificity in identifying patients with bladder cancer, regardless of tumor stage. Due to high-throughput capability, the identified differential protein panel may improve the detection of bladder cancer.

Asunto(s)

RESUMEN

CONTEXT: New data regarding diagnosis and treatment of muscle-invasive and metastatic bladder cancer (MiM-BC) has emerged and led to an update of the European Association of Urology (EAU) guidelines for MiM-BC. OBJECTIVE: To review the new EAU guidelines for MiM-BC. EVIDENCE ACQUISITION: A comprehensive workup of the literature obtained from Medline, the Cochrane central register of systematic reviews, and reference lists in publications and review articles was developed and screened by a group of urologists, oncologists, and radiologist appointed by the EAU Guideline Committee. Previous recommendations based on the older literature on this subject were taken into account. Levels of evidence and grade of guideline recommendations were added, modified from the Oxford Centre for Evidence-based Medicine Levels of Evidence. EVIDENCE SYNTHESIS: The diagnosis of muscle-invasive bladder cancer (BCa) is made by transurethral resection (TUR) and following histopathologic evaluation. Patients with confirmed muscle-invasive BCa should be staged by computed tomography (CT) scans of the chest, abdomen, and pelvis, if available. Adjuvant chemotherapy is currently only advised within clinical trials. Radical cystectomy (RC) is the treatment of choice for both sexes, and lymph node dissection should be an integral part of cystectomy. An orthotopic bladder substitute should be offered to both male and female patients lacking any contraindications, such as no tumour at the level of urethral dissection. Multimodality bladder-preserving treatment in localised disease is currently regarded only as an alternative in selected, well-informed, and compliant patients for whom cystectomy is not considered for clinical or personal reasons. An appropriate schedule for disease monitoring should be based on (1) natural timing of recurrence, (2) probability of disease recurrence, (3) functional deterioration at particular sites, and (4) consideration of treatment of a recurrence. In metastatic disease, the first-line treatment for patients fit enough to sustain cisplatin is cisplatin-containing combination chemotherapy. Presently, there is no standard second-line chemotherapy. CONCLUSIONS: These EAU guidelines are a short, comprehensive overview of the updated guidelines of (MiM-BC) as recently published in the EAU guidelines and also available in the National Guideline Clearinghouse.

Asunto(s)

RESUMEN

BACKGROUND: Several surgical procedures for the repair of fistulas between the rectum and the urethra or vagina have been reported. Our study was designed to assess the efficacy of the gracilis muscle flap in repairing recto-urethral and rectovaginal fistulas. METHODS: Gracilis muscle interposition flaps were performed in 35 patients (aged 38-78 years, mean: 58 years) using a perineal approach. Nine patients had rectovaginal fistulas due to Crohn's disease (n=3), previous surgery and pelvic irradiation for rectal (n=2) or cervical cancer (n=4). Twenty-six fistulas were recto-urethral. The aetiologies were Crohn's disease (n=4), brachytherapy after prostate cancer (n=14), iatrogenic injury to the rectum during radical retropubic prostatectomy (n=4), transurethral resection of the prostate (n=2) and recurrent peri-anal abscesses with fistulas (n=2). Twenty-five patients had undergone previous repair attempts; of these four underwent multiple procedures. Patient outcomes were assessed after surgical repair. The success rate was measured as the percentage of patients with a healed fistula after stomal closure. RESULTS: The mean follow-up was 28+/-15 months from muscle transposition and 22+/-14 months from stomal closure. Fistula closure with no recurrence could be achieved in 33 patients (94%). Two of the seven patients (29%) with Crohn's disease had a persistent fistula. There were neither intra-operative complications nor problems related to muscle desinsertion surgery. CONCLUSIONS: Recto-urethral and rectovaginal fistula closure using the perineal approach with pedicled gracilis muscle interposition is associated with minimal morbidity and a high success rate. It is an excellent option for patients with complicated fistulas for whom other surgical treatments have failed. Underlying Crohn's disease is associated with a higher complication rate.

Asunto(s)

RESUMEN

BACKGROUND AND PURPOSE: The aim of the study was to compare quality of life after permanent I-125 brachytherapy (BT) and external beam radiotherapy (EBRT) for prostate cancer. MATERIALS AND METHODS: A group of 104 patients (52 in each group) have been surveyed prospectively before EBRT/BT (time A), at the last day of EBRT (70.2-72.0 Gy) or one month after BT (time B), and a median time of 16 months after EBRT/BT (time C) using a validated questionnaire (Expanded Prostate Cancer Index Composite). Pairs were matched according to the following criteria: age +/-5 years, prostate volume +/-10 cc, use of antiandrogens, and erectile function. RESULTS: Urinary function/bother scores decreased significantly more after BT both at time B and time C. Bowel function/bother scores tended to be higher after BT, with a lower percentage of patients with painful bowel movements (BT: 12%/27%/15%; EBRT: 19%/52%/35% at time A/B/C; p<0.05 for differences at times B/C) and rectal bleeding (BT: 12%/12%/12%; EBRT: 8%/14%/17%). No difference concerning erectile dysfunction was found (67% vs. 61% with preserved erections firm enough for intercourse after BT vs. EBRT at time C). CONCLUSIONS: BT was associated with higher urinary, but lower rectal toxicity. The risk of treatment-associated erectile dysfunction did not differ between these methods.

Asunto(s)

RESUMEN

BACKGROUND AND PURPOSE: The aim of the study was to compare intra-operative and postplanning at different intervals with special focus on sources placed close to the rectal wall. MATERIALS AND METHODS: In 61 consecutive patients, CT scans were performed on day 1 and day 30 after an I-125 implant with stranded seeds. The number of sources < or =7 mm to the rectal wall was determined, and displacements were analyzed. The angulation of strands relative to rectal wall was compared between intra-operative transrectal ultrasound (TRUS) and both postplanning CT scans. RESULTS: Sources close to the rectum on day 1 (n=204) have been the most apical in a strand in 98.5% (n=201). By comparing day 1 and day 30 data, significant inferior source displacements (mean 3.6 mm; p=0.02) relative to pelvic bones and a decreasing distance to the rectal wall (mean 1.2 mm; p<0.01)--consequentially increasing rectal dose--were determined only for sources initially > or =3 mm to the rectum. In contrast to an almost parallel arrangement of the needle track and the rectal wall in TRUS, strands and rectal wall converged towards the apex in the postplanning CT scans (mean >30 degrees). CONCLUSIONS: Posterior preplanning margins around the prostate should be particularly limited at the level of the prostate apex.

Asunto(s)

RESUMEN

PURPOSE: To evaluate seed displacements after permanent prostate brachytherapy considering different prostate levels. PATIENTS AND METHODS: In 61 patients, postimplant CT scans were performed 1 day and 1 month after an implant with stranded seeds. Seed and prostate surface displacements were determined relative to pelvic bones. Four groups of seed locations were selected: seeds at the base (n = 305; B), at the apex (n = 305; A), close to the urethra (n = 306; U), and close to the rectal wall (n = 204; R). The length of two strands (always containing four seeds) per patient was measured in all CT scans and compared. RESULTS: The largest inferior seed displacements were found at the base: mean 5.3 mm (B), 2.2 mm (A), 2.7 mm (U), 3.3 mm (R; p < 0.001). Posterior displacements predominated both at the base and the central region: mean 2.2 mm (B), 2.0 mm (U), 0.8 mm (A), -0.6 mm (R; p < 0.001). With a decreasing edema between day 1 and 30 (mean prostate volume of 51 cm(3) vs. 41 cm(3); p < 0.001), a mean caudal prostate base displacement of 3.9 mm was found, whereas the mean inward displacement ranged from 1.2 to 1.6 mm at the remaining borders (lateral, anterior, posterior, apical). The analysis of the strand lengths revealed an implant compression between day 1 and 30 (mean 1.7 mm; p < 0.001). CONCLUSION: The largest prostate tissue and seed displacements were observed at the prostate base, associated with an implant compression. Predominantly inferior and posterior displacements implicate consequential smaller preplanning margins at the apex and the posterior prostate.

Asunto(s)

RESUMEN

OBJECTIVES: Imaging techniques with high resolution are evolving rapidly for medical applications and may substitute invasive diagnostic techniques. The use of ultrahigh resolution optical coherence tomography (UHR-OCT) to image healthy and morphologically altered bladder tissue with virtual histology is evaluated ex vivo to define parameters necessary for future, diagnostically relevant in vivo systems. Here, special focus is on the visualization of the basement membrane zone. METHODS: Optical coherence tomography examinations were performed by using a modified commercial OCT system comprising a Ti:sapphire femtosecond laser to support an enhanced resolution of 3 microm axial x 10 microm lateral. Tomograms of 142 fresh human bladder tissue samples from cystectomies, radical prostatectomies, and transurethral tumor resections were recorded and referenced to histologic sections using standard hematoxylin and eosin staining. RESULTS: OCT of normal bladder mucosa allows for a clear differentiation of urothelium and lamina propria. The basement membrane zone is identified as a narrow, low-scattering band between these layers. This allows for reliable exclusion of invasion. Healthy urothelial tissue, carcinoma in situ, and transitional cell carcinoma can be differentiated using this imaging technique. Sensitivity of UHR-OCT for malignant bladder tissue could be determined to be 83.8%, and specificity to be 78.1%. CONCLUSIONS: UHR-OCT is considered promising in the attempt to strive for fluorescence cystoscopy-guided virtual histology as a means of supporting therapeutic decisions for bladder neoplasia.

Asunto(s)

RESUMEN

PURPOSE: In 2002, the first completely laparoscopic cystectomy and orthotopic ileal neobladder procedure was reported to take more than 10 hours, with the most time-consuming portion being suturing. Therefore, to improve the quality and reduce the time to place running sutures, we developed a new sewing device for laparoscopic use. MATERIALS AND METHODS: We compared running sutures made by hand with those made by machine in the ilea of six pigs. The tightness of the closures was examined and the suturing time recorded. Two animals each were sacrificed after 3, 6, and 9 days, and then the explanted ilea were examined at both the macroscopic and microscopic levels. RESULTS: No animal died during the course of the experiment and no leaks were found postoperatively. Moreover, no significant differences were seen on macroscopic or microscopic examination in the quality of the two sets of sutures. The time taken to place 1 cm of running suture, including initial preparation, was 7.2 and 3 minutes for hand and machine suturing, respectively. The hand sutures were always initially tight, whereas those placed by machine required adjustment to stop leaks on four occasions. CONCLUSION: Using the Endosew device reduces the time needed to place running sutures by 2.4-fold. The quality of the hand- and machine-made sutures was nearly identical at both the macroscopic and microscopic level. Thus, the functionality of this new sewing device is more than satisfactory, and the amount of time saved by using it far outweighs the need for occasional adjustments to stop suture leakage.

Asunto(s)

Asunto(s)

RESUMEN

We report a unique case of a duplex kidney and ectopic ureter presenting as a cystic tumor of the seminal vesicle with consecutive dysuria in an adult. The medical history of the patient, the diagnostic pathway and the laparoscopic treatment as well as the key points in laparoscopic surgery are described.

Asunto(s)

RESUMEN

BACKGROUND AND PURPOSE: The aim of the study was to analyze source displacements and dose-volume changes in the first month after a permanent implant. MATERIALS AND METHODS: In 51 consecutive patients, CT scans were performed at the postoperative day (day 1) and one month (day 30) after an (125)I implant with stranded seeds. Seed positions were determined relative to pelvic bones for five seeds at the base and five seeds at the apex for each patient (n=510) and compared. To verify these results, treatment margins (TM=distance of prescription isodose to prostate) and displacements of the prostate surface (anterior/posterior/right/left/superior/inferior) relative to pelvic bones were measured. RESULTS: Seed positions have moved significantly between day 1 and 30 in the posterior (mean 1.0mm; p<0.001) and inferior (mean 3.8mm; p<0.001) directions. TM increased particularly at the posterior (mean 2.2mm; p<0.001) and apical (median 3.0mm; p<0.001) prostate contour with decreasing oedema. With a stable apex position and a mean inward posterior surface displacement of 1.1mm (p<0.001) relative to pelvic bones, seed displacements could be well correlated with prescription isodose displacements (Pearson correlation coefficients >or=0.81; p<0.001). CONCLUSIONS: Both changes of prostate volume and seed displacements need to be considered to explain dosimetric changes after permanent prostate brachytherapy.

Asunto(s)