A, Contrast-enhanced computed tomography (CT) shows a simple, 3-cm wide cyst of the renal sinus (arrows) found during investigation of renal calculi. Note subcapsular hematoma (arrowheads) detected after lithotripsy. B, Contrast-enhanced CT shows bilateral multiple cysts of the renal sinus, leading to chronic compression of the pelvis and subsequent renal atrophy.

Ultrasonographic appearance mimicked hydronephrosis. Also known as hilar lymphangiectasis or peripelvic (or parapelvic) cysts, this acquired disorder consists of dilated hilar lymph channels. Its frequency is about 1% in autopsy series. Although usually asymptomatic, cysts of the renal sinus can cause severe urinary obstruction, B.

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