[Spontaneous urinary extravasation due to chronic ureteral obstruction]

Area of Science:

• Urology
• Nephrology

Background:

• Spontaneous nontraumatic perirenal urinary extravasation is uncommon.
• Most cases result from acute ureteral calculus obstruction.
• Gradual-onset obstruction leading to extravasation is less frequent.

Purpose of the Study:

• To report four cases of spontaneous urinary extravasation due to chronic ureteral obstruction.
• To discuss the diagnostic and therapeutic strategies for this condition, particularly when caused by slow-onset obstruction.

Main Methods:

• Case series review.
• Analysis of clinical presentation, diagnostic imaging, and treatment outcomes.
• Literature review on spontaneous urinary extravasation.

Main Results:

• Three cases involved ureteral obstruction by tumors.
• One case was attributed to ureteral stricture from inflammation.
• All patients presented with spontaneous perirenal urinary extravasation.

Conclusions:

• Tumor obstruction and ureteral inflammation are significant causes of gradual-onset spontaneous urinary extravasation.
• Prompt diagnosis and appropriate management are crucial for favorable outcomes.
• Further research into chronic ureteral obstruction as a cause is warranted.