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Introduction: Differential diagnosis of hematuria after bone marrow transplantation (B.M.T.) may include polyomavirus (BK and JC)-associated haemorrhagic cystitis. Many reports have implied BK virus as the major pathogen in the development of hemorrhagic cystitis after BMT. BK viruria is also associated with ureteric stenosis in renal allografts recipients. Viral urinary tract infections are uncommon in healthy individuals, but we can find them frequently in patients under immunosuppressive conditions., Material and Methods: Retrospective study of 123 consecutive B.M.T. recipients in the period from 1995 to 2000, evaluating those with polyomavirus-associated hemorrhagic cystitis. We present patient's characteristics, primary disease, clinical features, diagnosis aspects and treatment of these "hidden hosts of urinary tract"., Results: 7 patients (5.7% of B.M.T.) developed BK or JC virus-associated hemorrhagic cystitis; 3 men and 4 women; median patient age was 29 years (range 14 to 45 years). Bacterial, mycobacterial and parasitic urine cultivates had negative results in all of them. The clinical course was characterized by a late onset of haemorrhagic cystitis (days +30 to +132 after BMT). All 7 patients developed macroscopic haematuria (duration 3 to 30 days). In 6 cases Graft Versus Host Disease (G.V.H.D.) criteria were found. Ultrasonographic studies revealed diffuse thickening of bladder wall in 5 patients. Hematuria was managed by hyperhydratation, blood transfusions, transurethral catheter and evacuation of blood clots, continuous bladder irrigation, urine alkalinization and antiviral therapy. No other more aggressive measures were required to stop the bleeding. Only 1 case of transient elevated creatinine., Conclusions: Polyomavirus-associated haemorrhagic cystitis must be considered in differential diagnosis of hematuria in bone marrow transplantation recipients. Urological management, according with the severity and duration of hematuria, is frequently required.

The extramodular hematopoiesis is the result of the bone marrow sever chronical hypofunction, being the genitourinary affection very unusual. We are presenting a singular case by its own clinicopathology consequences and exceptional incidence in context of a upper tract urothelial tumor.

The neuroendocrine renal tumors are of extremely strange presentation. We present a review of the literature published on this pathology.

Vaginal stones are rare. We can classify them as primary or secondary, depending on the presence or the absencse of a foreign body nidus. Various cases can led to stone formation. Most of them developed in women with a vesicovaginal or urethrovaginal fistula, as well as in patients with congenital anomalies of the genitourinary tract, previous pelvic radiotherapy, neuropathic bladder and other different causes of vaginal outlet obstruction. Secondary vaginal stones, formed around foreign bodies, are not so frequent. Radiological examination and urethro-vaginoscopy make easy the right diagnosis. Sometimes the stone may be fragmented by lithotripsy before the extraction. The associated etiology should be treated concomitantly in order to prevent recurrence. We report a case of primary vaginal stone associated with an urethrovaginal fistula in a 25 years old women and a review of the related literature.

Juvenile gangrenous vasculitis of the scrotum is a peculiar form of scrotal gangrene of undetermined etiology, with clinical and pathological features of its own, described in 1973 by Piñol et al. We report a new case, considering this entity as part of the differential diagnosis of scrotal gangrene, and a review of relative literature.

Trigonocervicotomy is a barely invasive technique for the treatment of infravesical obstruction, first introduced in the 60's by Turner-Warkic and Orandi. To achieve good results with this procedure, the selection criteria must take into account a series of parameters such as age, sexual activity, PSA, prostate weight (below 30 grams) and others. In addition to its low morbidity, a larger percentage of patients preserve ejaculation than with the use of other techniques, also the neck sclerosis rate being lower as seen in all our series and expertise. The efficacy of this technique was studied on 100 patients.

Presentation of eight cases of urinary candidiasis in patients who underwent radical cystectomy and were managed using by-pass of the urinary tract, oral antifungal therapy and solutions in the way of intermittent instillation through nephrostomy catheters.

Analysis of the infiltrant tumours of the bladder diagnosed in our service between 1986-1996 both inclusive, with associated tumour of the upper tract during its evolution. From a total of 262 infiltrant transitional tumours of the bladder and 52 transitional tumours of the upper urinary tract, 8 patients were found to have both types of tumours in association, which accounted for 3.05% of all infiltrant vesical tumours. Mean age of our patients, all male, was 65. The pathological anatomy of the upper tract tumours was: 4 pT1 and 4 pT3. 75% presented relapsing tumours of the bladder, 50% had a background of bladder Cys, 87.5% were multifocal vesical tumours and 100% were larger than 3 cm. In addition, 62% cases were ipsilateral to the tumours of the upper urinary tract. It can therefore be concluded that for tumours of the bladder, multifocality, relapse, presence of vesical Cys and tumour size, are all concurring features when association of these two types of tumours occurs.

The infection caused by the Human Immunodeficiency Virus (HIV), a retrovirus, leads to a progressive decline and to the suppression of cell-mediated immunity favouring the development of opportunistic diseases and potentially fatal neoplasias which are practically innocuous in individuals with an intact immunologic system. The number of AIDS cases recorded in Spain until March 1997 was 45,132, with a revised mortality rate of 58%. Cases in Murcia total 713 up to October 1997, of which 217 patients are being monitored in the AIDS Unit in our centre, 414 individuals have died in the region. It is well know that about one third of patients with diagnosed AIDS or who are HIV carriers will develop some type of genitourinary lesion, either as a result of a renal disorder, concurrent or not with HIV, or any other condition directly related to the infection. This is a report on our Service's experience in the treatment of HIV patients with genitourinary symptoms that, in a total of 15 cases, required our intervention. Emphasis is placed on the incidence of nephrolithiasis secondary to therapy with protease inhibitors over the last few months following introduction of this new therapeutic tool, prostatitis due to salmonella, and inlaid cystitis among others.

Vesical inverted papilloma (IP) is a transitional disease most commonly found in the bladder, representing a small percentage within the group of vesical neoformations. Although of benign behaviour, some authors advise that a relatively strict monitoring should be used considering its high rate of proliferative activity. It mainly affects males in their fifth to seventh decade, and it presents as any other transitional tumour. In about one fourth of the cases a transitional carcinoma becomes associated throughout its evolution, thus supporting the theory of periodic monitoring.