Is water vapor thermal therapy safe and feasible in elderly and frail men? The Italian experience.

PURPOSE: In recent years, water vapor thermal therapy (WVTT) has spread as minimally invasive technique in lower urinary tract symptoms due to benign prostatic hyperplasia treatment. Even if its safety and feasibility have been largely proved in young men, nobody has proved the same feasibility and safety in the elderly (men older than 75 years old). Our aim is to compare WVTT safety outcomes in men older than 75 with younger men. METHODS: We prospectively collected data on men who underwent water vapor thermal therapy from 2019. We compared data on operative time, number of injections, intra-operative and post-operative complications, reinterventions rate. RESULTS: We enrolled 426 patients; among these, 60 were older than 75 years old, 366 were younger. Our cohorts of patients had similar results in terms of intra-operative and post-operative complications. Operative time accounts about 11 min for both groups (p = 0.535), total number of injections was seven for young men and eight for elderly (p = 0.314). We found no intra-operative complications in elderly men group and only one in the younger group (p = 0.678), while five younger men underwent clot retention, and two elderly men experienced this complication (p = 0.239). Only one transfusion occurred in the elderly group. No differences between groups occurred in terms of length of stay, post-operative urinary retention and reintervention rate, while catheterization time was longer in the elderly men. CONCLUSION: WVTT is a safe procedure in elderly patients with comparable intra-operative and post-operative complication rate in comparison with younger patients.

Radiological assessment of dementia: the Italian inter-society consensus for a practical and clinically oriented guide to image acquisition, evaluation, and reporting.

BACKGROUND: Radiological evaluation of dementia is expected to increase more and more in routine practice due to both the primary role of neuroimaging in the diagnostic pathway and the increasing incidence of the disease. Despite this, radiologists often do not follow a disease-oriented approach to image interpretation, for several reasons, leading to reports of limited value to clinicians. In our work, through an intersocietal consensus on the main mandatory knowledge about dementia, we proposed a disease-oriented protocol to optimize and standardize the acquisition/evaluation/interpretation and reporting of radiological images. Our main purpose is to provide a practical guideline for the radiologist to help increase the effectiveness of interdisciplinary dialogue and diagnostic accuracy in daily practice. RESULTS: We defined key clinical and imaging features of the dementias (A), recommended MRI protocol (B), proposed a disease-oriented imaging evaluation and interpretation (C) and report (D) with a glimpse to future avenues (E). The proposed radiological practice is to systematically evaluate and score atrophy, white matter changes, microbleeds, small vessel disease, consider the use of quantitative measures using commercial software tools critically, and adopt a structured disease-oriented report. In the expanding field of cognitive disorders, the only effective assessment approach is the standardized disease-oriented one, which includes a multidisciplinary integration of the clinical picture, MRI, CSF and blood biomarkers and nuclear medicine.

Primary melanoma of the bladder: Case report and review of the literature.

Skin melanoma represents one of the most common and lethal solid tumor. It usually develops on the skin but it can occur in any tissues with melanine- containing-cells (extracutaneous malignant melanoma). Only 4-5% of malignant melanomas originate in extracutaneous tissues, and they have an extremely lethal behavior (1). These non-skin malignant melanomas are rare but extremely aggressive. Primary melanoma of the genitourinary tract accounts for less than 0.2% of all melanomas. To date only 28 cases of primary bladder melanoma (PMM) are described. We report a rare case of PMM of the bladder in a 72 years old man treated with radical cystectomy and immunotherapy with Nivolumab.

INSIST-ED: Italian Society of Andrology registry on penile prosthesis surgery. First data analysis.

OBJECTIVES: The Italian Society of Andrology, i.e. "Società Italiana di Andrologia" (S.I.A.), launched on December 2014 a prospective, multicenter, monitored and internal review board approved Registry for penile implants, the "INSIST-ED" (Italian Nationwide Systematic Inventarisation of Surgical Treatment for ED) Registry. Purpose of this first report is to present a baseline data analysis of the characteristics of penile implant surgery in Italy. MATERIAL AND METHODS: The INSIST-ED Registry is open to all surgeons implanting penile prostheses (all brands, all models) in Italy, providing anonymous patient, device, surgical procedure, outcome, follow-up data, for both first and revision surgeries. A Registry project Board overviews all the steps of the project, and a Registry Monitor interacts with the Registry implanting surgeons. RESULTS: As by April 8, 2016, 31 implanting surgeons actively joined the Registry, entering 367 surgical procedures in its database, that comprise: 310 first implants, 43 prosthesis substitutions, 14 device explants without substitution. Implanted devices account for: 288 three-component devices (81,3%), 20 two-component devices (5,4%), 45 non-hydraulic devices (12,3%). Leading primary ED etiologies in first implant surgeries resulted: former radical pelvic surgery in 111 cases (35,8%), Peyronie's disease in 66 cases (21,3%), diabetes in 39 cases (12,6%). Two intraoperative complications have been recorded. Main reasons for 57 revision surgeries were: device failure (52,6%), erosion (19,3%), infection (12,3%), patient dissatisfaction (10,5%). Surgical settings for patients undergoing a first penile implant were: public hospitals in 251 cases (81%), private environments in 59 cases (19%). CONCLUSIONS: The INSIST-ED Registry represents the first European experience of penile prosthesis Registry. This baseline data analysis shows that: three-pieces inflatable prosthesis is the most implanted device, leading etiology of erectile dysfunction (ED) in patient receiving a prosthesis is former radical pelvic surgery, primary reason for revision surgery is device failure, primary settings for first penile implant surgery are public hospitals. Evaluation of penile implant impact on recipients quality of life is presently ongoing.

Do Patients Treated with Water Vapor Therapy and Meeting Randomized Clinical Trial Criteria Have Better Urinary and Sexual Outcomes Than an Unselected Cohort?

Introduction: Water vapor intraprostatic injection (Rezum procedure) for benign prostatic hyperplasia (BPH) is one of the most promising minimally invasive surgical treatments. Five-year outcomes from the multicenter randomized controlled trial (RCT) demonstrated significant and durable urinary and sexual function results in selected patients. We compared the sexual and urinary outcomes of this procedure in patients satisfying inclusion criteria of the RCT with unselected patients. Materials and Methods: We prospectively followed all patients with symptomatic BPH who underwent Rezum therapy at eight institutions and analyzed the functional results. Patients were divided into two groups: patients who matched the 5-year RCT inclusion criteria (Group A) and patients who did not (Group B). The pre- and postoperative data, complications, presence of antegrade ejaculation, and urinary and sexual outcomes were periodically recorded. Results: A total of 426 patients were eligible for the study (232 in Group A and 194 in Group B). Patients in Group B had a higher American Society of Anesthesiologists score, prostate volume, and postvoid residual measurement. No difference was found in terms of preoperative International Prostate Symptom Score, International Index of Erectile Function, maximum urinary flow, and prostate-specific antigen. Longer operative time and higher number of vapor injections were required in Group B, with no differences in hospital stay, injection density, and complication rates. All the urinary and sexual outcomes improved with no differences between the two groups. The reintervention rate at the latest follow-up visit was 2.6% in Group A and 3.1% in Group B. Conclusions: In our large multicenter series, water vapor intraprostatic injections showed a safe and effective profile regardless of the prostate size, presence of indwelling catheter, antiplatelet/anticoagulant medications, and patients' comorbidities.

One-year outcomes after water vapor thermal therapy for symptomatic benign prostatic hyperplasia in an unselected Italian multicenter cohort.

BACKGROUND: Water vapor therapy (Rezum®; Boston Scientific, Marlborough, MA, USA) for bladder outflow obstruction (BOO) due to benign prostatic enlargement (BPE) is a minimally invasive and innovative surgical technique. The aim of this study was to evaluate its mid-term results in a large multicentric cohort of Italian patients. METHODS: Patients with BPO and moderate to severe LUTS who underwent Rezum® (Boston Scientific) treatment from May 2019 to July 2021 were included in this study. Pre- and postoperative evaluation comprised full urological evaluation with urine culture, digital rectal examination, serum PSA, transrectal prostate ultrasound, uroflowmetry, post-void residual and IPSS, OAB-q SF, ICIQ-UI SF and IIEF-5, ejaculatory anterograde rate. Minimum follow-up was 12 months. Patients' subjective satisfaction was recorded with Patient Global Impression of Improvement (PGI-I) Scale together with any early or late reported complications, classified according to Clavien-Dindo Scale. Statistical analysis was conducted as appropriate. RESULTS: Overall, 352 patients were eligible for the analysis. Procedures were routinely done on an outpatient basis. Mean operative was 12 minutes. The catheter was left in place for a median of 7 days. After treatment, Qmax, IPSS and IPSS-QoL, OAB-q SF, ICIQ-UI SF and IIEF-5 from baseline to last control follow-up (median 16, IQR 13-20 months) were improved (P<0.05). The postoperative anterograde ejaculation rate was recorded in 74.1% vs. preoperative 43.8% (P<0.001). Early (≤30 days) postoperative complications occurred in 176 patients (50%), all Clavien-Dindo Grade ≤2. One patient experienced clot retention and hematuria requiring hospitalization and blood transfusion. No late AEs were recorded. Surgical retreatment rate was 2.5% (9/352), all cases occurred within the first year. Median PGI-I was 2 (1-2). CONCLUSIONS: We confirmed the safety and efficacy of water vapor therapy for the treatment of symptomatic benign prostatic obstruction (BPO) on a large cohort of patients. Anterograde ejaculation was preserved in the majority of patients, with good subjective improvement. Further studies may rule out possible role of Rezum® (Boston Scientific) in new patients' setting.

Composite urinary and sexual outcomes after Rezum: an analysis of predictive factors from an Italian multi-centric study.

BACKGROUND: The Rezum system is one of the latest minimally invasive surgical treatments for benign prostatic hyperplasia. METHODS: We retrospectively reviewed all patients who underwent the Rezum treatment in seven different Italian institutions. A successful urinary outcome was defined as: ≥50% improvement in the IPSS <7, improvement in peak flow ≥50% and/or more than 15 ml/s, ≥1-point improvement in the QoL questionnaire and in the absence of perioperative major complications (AUR, transfusion) or postoperative incontinence. A successful sexual outcome was defined as postoperative (latest follow up consultation) antegrade ejaculation or no variation in ejaculatory function and an increase, or stability or max 1 class reduction, in IIEF-5. RESULTS: 262 patients were enrolled with a follow-up period of 11 months (IQR 5-15). No early or late serious adverse events (Clavien III-IV) occurred. Early complications occurred in 39.3% of cases, with 4 cases of clot retention and one case of blood transfusion. Urge incontinence was reported by 6 patients (2.2%). A treatment failure requiring re-intervention occurred in 4 cases (1.5%). The preoperative antegrade ejaculation rate was 56.5%, and after the procedure it increased to 78.2%. The increase of ≥1-point in the QoL was achieved in 92.7% of the cases. Optimal urinary and sexual outcomes were achieved in 52.9% and 87.8%, respectively. CONCLUSIONS: In our series, water vapor intraprostatic injections seem to be an effective and safe procedure.

Risk of unfavorable outcomes after penile prosthesis implantation - results from a national registry (INSIST-ED).

Like all surgeries, penile prosthesis implantation (PPI) has the potential for both postoperative complications and suboptimal patient satisfaction. In order to assess risk factors for poor satisfaction, we reviewed patients who had been prospectively recruited in a national multi-institutional registry of penile prostheses procedures (INSIST-ED) from 2014 to 20121. Patient baseline characteristics and postoperative complications were recorded. The primary endpoint of this study was unfavorable outcomes after inflatable PPI, defined as significant postoperative complications (Clavien-Dindo ≥2) and/or Sexuality with Quality of Life and Sexuality with Penile Prosthesis (QoLSPP) scores below the 10th percentile. A total of 256 patients were included in the study. The median age was 60 years (IQR 56-67). The most common cause of erectile dysfunction (ED) was organic (42.2%), followed by pelvic surgery/radiotherapy (39.8%) and Peyronie's disease (18.0%). Postoperative complications were recorded in 9.6%. High-grade complications (Clavien ≥2) occurred in 4.7%. At 1-year follow-up, the median QoLSPP total score was 71 (IQR 65-76). In all, 14.8% of patients were classified as having experienced unfavorable outcomes because of significant postoperative complications and/or QoLSPP scores below the 10th percentile. Logistic regression analysis demonstrated patient age to be non-linearly associated with the risk of experiencing unfavorable outcomes. A U-shaped correlation showed a lower risk for younger and older patients and a higher risk for middle-aged men. ED etiology and surgical volume were not associated with PPI outcomes. Physicians should, therefore, be aware that middle-aged men may be at higher risk of being unsatisfied following PPI compared to both younger and older patients.

Formative-reflective scheme for the assessment of tourism destination competitiveness: an analysis of Italian municipalities.

In this article, we propose a formative-reflective scheme for the assessment of Tourism Destination Competitiveness (TDC) based on a combined use of Partial Least Squares-Path Modelling (PLS-PM) and the method recently proposed by Fattore, Pelagatti, and Vittadini (FPV). TDC is conceived as a construct reflecting the tourism performance of a destination, and several determinants are considered, including endowed resources, created resources, and supporting factors. The proposed scheme is applied to a case study on 1575 Italian municipalities for which the Italian National Institute of Statistics released data on tourist flows. Our contribution is innovative for three aspects: (i) the consistency of the formative-reflective scheme for TDC assessment is discussed on a theoretical basis; (ii) an empirical comparison between PLS-PM and the FPV method is performed; (iii) data with higher granularity than most studies on TDC assessment are employed. Our findings highlight that endowed resources are the primary driver of TDC, followed by created resources and supporting factors, and emphasize that the best ranked destinations are big cities with a multifaceted tourism alongside sea and mountain destinations with cultural attractions.

Clear-cell renal cell carcinoma single thyroid metastasis: A single-center retrospective analysis and review of the literature.

Renal cell carcinoma (RCC) is known to cause metastasis to unusual sites, which can be both synchronous or metachronous. Thyroid gland is a rare site for metastasis. However, RCC is the most common primary neoplasm to metastasize to the Thyroid gland. Report of three cases and review of the literature.

Functional and Idiopathic Cervical Dystonia in Two Family Members: A Challenging Diagnosis.

Background: Cervical dystonia (CD) often occurs in the same family. Case report: A 40-year-old woman presented with a longstanding history of CD and signs of inconsistency at history taking and neurological examination; her 65-year-old mother was diagnosed instead with idiopathic CD, which had begun 7 years after the onset of CD in her daughter. Discussion: Idiopathic and functional CD share common clinical and endophenotypic traits, making the differential diagnosis particularly challenging. A complete examination is warranted.

Functional Motor Disorders Mimicking Symptoms Upon Resolution of Cerebrovascular Disease.

BACKGROUND: Functional motor disorders encompass a variety of manifestations characterized by abnormal movements that are clinically incongruent with those known to be caused by neurological diseases. CASES: We report 2 cases in which functional motor disorders developed after complete recovery of motor symptoms originating from underlying vascular brain lesions. The first case describes a young woman who developed a motor and sensory hemisyndrome after surgical removal of a postrolandic cavernoma. The second describes a 16-year-old girl who presented with a mixed component tremor after ventricular derivation and endovascular embolization for rupture of a brainstem arteriovenous malformation. CONCLUSION: Motor symptoms and signs attributed to an underlying lesion may trigger "pure" functional motor disorders. In such cases, the differential diagnosis may be even more challenging. However, diagnosis of a functional rather than a defined structural disorder can be achieved by a "positive diagnostic process," considering the findings of internal inconsistency and incongruity.

Nonlinear elasticity of stiff filament networks: strain stiffening, negative normal stress, and filament alignment in fibrin gels.

Many biomaterials formed by cross-linked semiflexible or rigid filaments exhibit nonlinear theology in the form of strain-stiffening and negative normal stress when samples are deformed in simple shear geometry. Two different classes of theoretical models have been developed to explain this nonlinear elastic response, which is neither predicted by rubber elasticity theory nor observed in elastomers or gels formed by flexible polymers. One model considers the response of isotropic networks of semiflexible polymers that have nonlinear force-elongation relations arising from their thermal fluctuations. The other considers networks of rigid filaments with linear force-elongation relations in which nonlinearity arises from nonaffine deformation and a shift from filament bending to stretching at increasing strains. Fibrin gels are a good experimental system to test these theories because the fibrin monomer assembles under different conditions to form either thermally fluctuating protofibrils with persistence length on the order of the network mesh size, or thicker rigid fibers. Comparison of rheologic and optical measurements shows that strain stiffening and negative normal stress appear at smaller strains than those at which filament orientation is evident from birefringence. Comparisons of shear to normal stresses and the strain-dependence of shear moduli and birefringence suggest methods to evaluate the applicability of different theories of rod-like polymer networks. The strain-dependence of the ratio of normal stress to shear stress is one parameter that distinguishes semiflexible and rigid filament models, and comparisons with experiments reveal conditions under which specific theories may be applicable.

Sensitivity of fluorine-18-fluoromethylcholine PET/CT to prostate-specific antigen over different plasma levels: a retrospective study in a cohort of 192 patients with prostate cancer.

PURPOSE: Several factors have been identified that predict positive fluorine-18-fluoromethylcholine (F-FCH) PET/CT result in patients with prostate cancer undergoing PET/CT for biochemical failure. Among these factors, prostate-specific antigen (PSA) is the single factor most consistently associated with the prediction of positive F-FCH PET/CT. In this study, we wished to confirm this finding and expand it in a large series of patients. PATIENTS AND METHODS: We retrospectively analyzed 192 patients with prostate cancer who were recruited from the Nuclear Medicine Department of the Sant'Andrea Hospital of La Spezia, Italy, from March 2013 to March 2018 and who underwent F-FCH PET/CT owing to biochemical failure after radical prostatectomy. RESULTS: Median trigger PSA was 2.57 ng/ml. The overall positive detection rate of F-FCH PET/CT was 60.9%. The percent of positive scans was 30.5% for PSA less than 1 ng/ml, 59.4% (38/64) for PSA between 1 and 5 ng/ml, and 88.4% for PSA greater than 5 ng/ml (P<0.001). On univariate regression analysis, high PSA levels, biochemical failure during antiandrogenic therapy at the time of PET/CT, and older age significantly (P<0.05) predicted positive F-FCH PET/CT result. On multivariate regression analysis, only high PSA levels and biochemical failure during antiandrogenic therapy maintained the statistical significance (P<0.05). However, when the analysis was restricted to patients with PSA less than 1 ng/ml, PSA lost the statistical significance. Receiver operating characteristic analysis revealed an area under the curve of 0.795. The PSA cutoff value that best distinguished PET/CT-positive from PET/CT-negative patients was 2.57 ng/ml. Sensitivity and specificity at this PSA value were 66.7 and 76.0%, respectively. CONCLUSION: This study confirms that PSA robustly predicts positive PET/CT result with radiolabeled choline. Unfortunately, this study also confirms the limited sensitivity of F-FCH PET/CT for PSA less than 1 ng/ml, which currently represents the weakest point of the technique.

Periprostatic tissues intraoperative frozen section during retrograde radical retropubic prostatectomy.

OBJECTIVE: To evaluate usefulness of periprostatic tissues intraoperative frozen sections (PTs IFSs) during RRP for prostate cancer, in order to find local extraprostatic neoplastic spreading and to eventually modify intervention and resection limits during surgery. MATERIAL AND METHODS: From January 1998 to June 2004, 259 consecutive patients underwent RRP at our department for clinically organ-confined prostate cancer; PTs IFSs were prospectively performed in all cases at membranous urethra after removal of prostatic apex, at whole neurovascular bundle (NVB) or at fibroadipose tissue subtended between prostatic capsule and NVB during extrafascial or nerve sparing (NS) RRP respectively, at middle portion of Denonvillier's fascia, at detrusor ring after removal of the prostate. IFSs positivity was followed by further excision at the corresponding site during intervention. RRP pathological specimen was handled and examined according to European Association of Urology (EAU) guidelines. Student's t-test and chi-square test were used for statistic analysis, matching patients with or without positive PTs IFSs for bioptic Gleason sum, preoperative serum PSA, clinical stage and lymph nodal involvement. RESULTS: PTs IFSs were positive 75 times in 63 patients out of 259. Pathological stage considering PTs IFSs overlapped 2002 TNM definitive pathological stage in 228 patients. The remaining 31 cases showed PTs neoplastic involvement at IFSs. These latter patients did not show prostatic capsular infiltration at definitive pathology. We demostrated intraoperative extraprostatic cancer spreading that was unrecognizable at definitive pathology. PTs neoplastic spreading changed NS RRP in extrafascial procedure in 17 patients out of 121 with preoperative planned NS RRP There were no significant statistic differences between patients with or without positive periprostatic margins (PMs), regarding preoperative serum PSA, bioptic Gleason sum and clinical stage (Student's t-test); lymph nodal involvement rate was not significantly different in both groups (chi-square test). CONCLUSIONS: PTs IFSs during RRP were feasible and effective in order to achieve better local pathological staging in 12% of patients, to modify planned nerve sparing RRP in extrafascial procedure in 14% of cases and to wide intraoperatively surgical resection margins in 24% of patients.

Color Doppler sonography in the intratesticular varicocele.

OBJECTIVE: We describe and discuss clinical and color Doppler ultrasound findings of intratesticular varicocele. MATERIAL AND METHODS: Since 1998 we evaluated 295 patients diagnosed with varicocele by scrotal color Doppler sonography Routine andrological assessment has entailed grading the varicocele (Dubin-Amelar scale and Dubin Doppler scale) and the assessment of testicular size. Intratesticular varicocele is defined as venous reflux detected into anechoic lesions of the testis with or without ypsilateral varicocele. RESULTS: We detected 4 intratesticular varicoceles (1.3%), in all cases left sided with ypsilateral extratesticular varicocele. Three patients had a large varicocele, one patient had a small varicocele and bylateral testicular hypotrophy. All patients had a slight to severe worsening of sperm quality. CONCLUSIONS: Intratesticular varicocele is an uncommon lesion, first described only after the color Doppler ultrasound studies have been a wide diffusion in the 1990s. A few cases are reported in literature and its incidence is unknown. Data about fertility in males with intratesticular varicocele are still anecdotic. Moreover, the knowledge of intratesticular varicocele may rule out patients for sclerotherapy procedures, or the awarness of potential gonadal damage by aetoxysclerol spread into the testis, may suggest some technical tricks. Since the simple detection of this lesion, further investigations are needed to clarify its clinical and pathophysiological significances. Color Doppler Sonography appears to be the only tool able to identify intratesticular varicocele in order to learn more about this rare condition.

Inflammatory fibrosarcoma of the urachus: a case report.

The Authors reported a case of inflammatory fibrosarcoma of the urachus in a 27-year old woman. Differential diagnosis, surgical therapy and prognosis were discussed.

Evaluation of the cytokines in genital secretions of patients with chronic prostatitis.

OBJECTIVES: In order to identify a specific prostatic inflammation marker we have assayed IL-6 and IL-8 cytokines levels in the genital secretions of men suffering from chronic prostatitis symptoms. MATERIALS AND METHODS: 207 patients underwent the following tests IL-6 and IL-8 were assayed in the genital secretions (seminal plasma:n.101-and- expressed prostatic secretion (EPS):n.106) by flow-cytometry; Meares-Stamey's test + leukocyte count in the EPS (microscopy-HPF/x1,000), semen analysis (WHO criteria), NIH/CPSI questionnaire. The control group was composed of 62 men with normal ejaculates (WHO criteria) and without symptoms or obstruction. We referred to Prostatitis classification-NIH, 1995. We considered as affected by prostatic inflammations those patients with high levels of IL-6 and/or IL-8 concentration in genital secretion. Statistical analysis was performed using: linear regression tests, Student's T-test, Chi-square and McNemar's test. RESULTS: High levels of IL-6 and/or IL-8 were found in 177/207 cases (85.5%) and the leukocyte count had a positive result only in 85/177 cases (48%). There was a statistically significant difference between cytokine levels measured on 207 cases with chronic prostatitis and citokine levels measured on the control group (P<0.001). There was a correlation between cytokines values and Symptoms Score (CPSI). CONCLUSION: IL-6 and IL-8 levels are frequently elevated in genital secretions of patients with prostatic inflammation and may prove to be excellent markers to identify and manage chronic prostatitis.

[Use of frozen sections to assess surgical margins during radical prostatectomy]. / Impiego dell'esame estemporaneo al congelatore per la valutazione dei margini chirurgici in corso di prostatectomia radicale

INTRODUCTION: At present there is no consensus on the use of frozen sections (FS) during radical prostatectomy. Several groups have proposed the benefit of FS although the studies differ widely in sampling methods and sites where FS were taken. This study aims to evaluate the usefulness and reliability of standard assessment of FS in multiple sites during radical prostatectomy. METHODS: During open radical prostatectomy in all patients we sampled tissue from the urethral stump, the neurovascular bundles, the Denonvillier fascia and the bladder neck after removing the prostate. Where FS showed positive margins, further periprostatic tissue was resected from the prostatic bed until negative margins were achieved. The results of FS were compared with margin status of final pathology. RESULTS: From 1998 to 2004 we performed FS during 250 consecutive open radical prostatectomies (104 nerve sparing procedures). 66 patients had positive FS (26.4%) and 53 patients had positive surgical margins at final pathology (21.2%). All patients with positive FS had negative margins when further tissue was resected in the prostatic bed. During nerve sparing procedures positive FS were found in 14 patients. In these cases the procedure was converted into standard prostatectomy by resecting the neurovascular bundles. Sensibility and specificity were both 90%. Positive and negative predictive values were respectively 72% and 97%. CONCLUSIONS: Standard assessment of FS in multiple sites during radical prostatectomy achieved sensibility and specificity as high as 90%. Although the resection of urethral stump and tissue close to the neurovascular bundles could compromise functional results, standard assessment of FS in multiple sites could help the surgeon to reduce the positive surgical margins, to monitor the oncological safety of a nerve sparing procedure and to improve the pathological staging.

Cross-linked networks of stiff filaments exhibit negative normal stress.

Motivated by recent experiments showing that a variety of stiff biopolymer gels exhibit highly unusual negative normal elastic stresses, we simulate networks of elastic rods over a wide range of concentrations and bending stiffness. In all cases, we find that sheared networks develop significant negative normal stresses that coincide with other elastic nonlinearities, including shear stiffening and compressive bucking. The threshold strain for normal stress in these athermal networks increases with both concentration and stiffness, in contrast with prior predictions for thermal networks. This may provide an experimental test for entropic vs enthalpic effects in such networks.