Urinoma

Area of Science:

• Urology
• Radiology
• Nephrology

Background:

• A urinoma is an encapsulated collection of extravasated urine.
• It can result from renal injury, surgery, or spontaneous obstruction.
• Key factors include renal function, collecting system rupture, and distal obstruction.

Observation:

• Urine extravasation is localized within the perirenal fascia.
• This triggers a significant fibrous reaction, forming a thick wall around the collection.
• Clinical signs include malaise, abdominal pain, weight loss, and a palpable mass.

Findings:

• Plain films may show a mass obscuring retroperitoneal landmarks.
• High-dose excretion urography can reveal renal displacement, hydronephrosis, and contrast extravasation.
• Ultrasound-guided renal puncture is indicated if renal function is insufficient for urography.

Implications:

• Prompt diagnosis is essential for successful urinoma management.
• Understanding the pathophysiology aids in identifying at-risk patients.
• Imaging modalities play a critical role in diagnosis and treatment planning.