Uriniferous pseudocyst: computed tomographic findings.

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Abstract
The computed tomographic (CT) scans of 9 consecutive patients with proved uriniferous pseudocyst (UP) were analyzed retrospectively. Analysis disclosed perirenal space tumefaction in 7 patients, tumefaction outside the perirenal space in 2 patients, cystlike uniformity of attenuation (with specific exceptions) in all 9 patients, contrast medium-opacified urine extravasating into the UP in three patients, contrast material within the dependent portion of the UP in 1 patient, anterior and superior displacement of the kidney in 7 patients, hydronephrosis in all 9 patients, and associated findings suggesting the underlying cause of UP in 5 patients. Although these CT findings appear to be quite specific, consideration of this uncommon entity in the CT differential diagnosis requires knowledge of its reported cause, the patient''s medical history, and the clinical presentation.