John A. Mata

Anatomic, functional, and pathologic changes from internal ureteral stent placement☆

The anatomic, hydrodynamic, functional, and pathologic changes associated with unilateral internal ureteral stenting were evaluated in 20 female canines. Selective glomerular filtration rates (GFR) were measured with technetium 99m diethylenetriamine pentaacetic acid (DTPA) renal scans (N = 14) prior to and several weeks after unilateral internal stent placement. Cystometry and cystography were done at weekly intervals to determine if reflux occurred and to measure the intravesical pressure to produce this reflux (N = 16). Ureteral lumenal capacities of mid 6-cm ureteral segments of stented and unstented ureters were compared. The mid-ureteral lumenal volumes were three times greater in the stented ureters (p < 0.002). There were no significant differences in the selective GFR before and after stenting. Low-pressure vesicoureteral reflux occurred at a mean intravesical pressure of 13.7 cm of water and was present in 84.6 percent (11/13) of the canines whose stents did not migrate or obstruct from encrustation. There were no significant alterations in serum chemistries or blood counts. Fluoroscopic imaging also showed ineffective ureteral peristalsis. This study confirms that internal ureteral stents cause vesicoureteral reflux and significant lumenal dilation without altering renal function.

Ultrasound Guided Percutaneous Renal Biopsy Using an Automatic Core Biopsy System

With real-time ultrasound visualization and an automatic core biopsy system 23 percutaneous renal biopsies were performed with the use of local anesthesia in 22 patients. Adequate tissue for diagnosis was obtained in all 23 cases, with 1 patient undergoing bilateral renal biopsy and 1 requiring repeat biopsy. One patient had an asymptomatic perirenal hematoma and 1 experienced a single episode of transient gross hematuria. There were no major complications. The use of an automatic core biopsy system guided by real-time ultrasound is an important technique that may be added to the urological armamentarium.

Ureteral injury in abdominal vascular reconstructive surgery

Iatrogenic ureteral injuries in vascular reconstructive surgery are rarely reported. We present a case of ureteral transection during repair of an aortic aneurysm in a patient with a previously placed aortobifemoral graft. In reported series of surgical ureteral injuries, 17 of 381 injuries occurred during vascular procedures. A review of the literature and management scheme for ureteral complications in the presence of prosthetic vascular grafts is presented in light of current endourologic materials and techniques.

Acquired immunodeficiency syndrome manifesting as prostate nodule secondary to cryptococcal infection

We report the first case of acquired immunodeficiency syndrome (AIDS) presenting as prostate nodularity secondary to mycotic granulomatous prostatitis which mimicked prostatic cancer on digital rectal examination. Transrectal ultrasonography revealed hypoechoic areas in the peripheral zone, which on biopsy specimen were found to represent cryptococcal infection. Subsequent serologic evaluation of the patient confirmed human immunodeficiency virus (HIV) positivity and later AIDS developed in the patient.

Acute urinary retention in a child withappendiceal abscess: Diagnostic dilemma

Rarely do children with appendiceal abscess present with acute urinary retention as the only sign or symptom. This presentation may delay diagnosis and definitive therapy, thereby causing additional morbidity and possible mortality. We report the eighth case of acute urinary retention in a child associated with an appendiceal abscess.

Penile Malignant Melanoma in Association with Squamous Cell Carcinoma of the Penis

We report a case of malignant melanoma of the penis in association with penile squamous cell cancer. Previous regional lymphadenectomy did not prevent subsequent development of regional recurrence. This clinical presentation and the literature are discussed.

Ureteral Catheter Tip Separation: Potential Risk Using the Open-end Flexi-tip Ureteral Catheter

Ureteral catheters are a vital part of the urological armamentarium. We report 2 cases in which the flexible tip portion of an open-end Flexi-Tip ureteral catheter became disjointed from the shaft within the renal collecting system during endourological procedures. The etiology, prevention and management of this complication are discussed.

Penetrating Trauma to the Male External Genitalia

BACKGROUNDnWe report on 40 patients with penetrating trauma to the external genitalia. Initial evaluation and management, operative findings, and treatment outcomes are reviewed.nnnMETHODSnWe retrospectively reviewed the medical records of all patients presenting to our facility with penetrating trauma to the external genitalia since 1988.nnnRESULTSnOf the 40 patients reviewed, 22 sustained isolated scrotal trauma, 10 sustained isolated penile trauma, and 8 had both scrotal and penile injuries. Twenty-nine of the 30 men with scrotal injuries underwent surgical exploration, and 21 of these were found to have injuries to the spermatic cord or testes (in 2 patients, bilateral injuries were noted). The testicular salvage rate was 35%. Penile trauma occurred in 18 patients. Eight corporal injuries and four urethral injuries were managed with debridement and primary repair. Erection and normal voiding was present in all men undergoing reconstruction who returned for follow-up. Thirty-eight percent of tested patients were positive for hepatitis B, C, or both. More than 60% of tested patients were legally intoxicated at the time of injury. Injuries separate from genitourinary trauma were identified in 72% of the men.nnnCONCLUSIONnEarly surgical exploration with conservative debridement and primary repair of injured structures is recommended for most men who sustain penetrating injuries to the external genitalia. Selected patients with superficial injuries can be managed nonoperatively, but delayed wound complications are not uncommon. Although universal precautions are recommended for all patients, the high prevalence of hepatitis B and C in this group reemphasizes their importance. Long-term follow-up in this largely young, mobile, indigent population was poor.

Unresectable calcified bladder tumor: Hemiacidrin irrigation as an adjunct to resection

Radiographic calcification of urothelial malignancies is an uncommon finding. To our knowledge, calcification of transitional cell carcinoma of the bladder preventing transurethral resection has not been reported previously. We report a case of an initially unresectable radiopaque bladder tumor and discuss the successful, conservative management with continuous bladder irrigation with hemiacidrin followed by complete transurethral resection.