Introduction. Rupture of the urinary collecting system, associated with
perirenal or retroperitoneal extravasation of the urine, is a rare condition
usually associated with the obstruction of the urinary system. A urinoma is
a localized collection of urine in the retroperitoneum, outside the urinary
tract, and occurs after injury to the wall of the urinary system. Ureteral
obstruction caused by a bladder tumor is a rare cause of urinoma. Case
Report. We report a case of a 62-year-old patient who was admitted to the
Clinic of Urology of the Clinical Center of Serbia, due to an invasive
bladder cancer. A computerized tomography scan of the abdomen and pelvis
revealed a massive bladder tumor dominant on the left side, invading the
vagina, uterus and significantly obstructing both kidneys.
Intraoperatively, a mass of 18 cm in diameter was identified in the right
retroperitoneal space and it was dissected from the peritoneum. Two liters
of clear fluid were aspirated from the mass, and the walls of urinoma were
resected. The site of perforation was not identified. The patient underwent
anterior pelvic exenteration. The pathohistological analysis revealed a
high grade transitional cell carcinoma of the bladder. The treatment is
individual and involves surgical and interventional radiology treatment.
Conclusion. A spontaneous retroperitoneal urinoma is a very rare condition.
In this case report it appeared most likely due to right ureteral
obstruction and perforation. The growth of urinoma was slow, due to the
absence of acute symptoms and the thickness of the urinoma wall.