PMC9647126_01
Coronal-enhanced CT in portal (A) and delayed phase (B) showing pelvi renal (white arrow) and perirenal cysts communicating with a huge right retroperitoneal collection (red arrow). These cysts were not field with the contrast agent in the delayed phase excluding a hydronephrosis as a differential.
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They were also peripelvic cysts (Fig. 1).
Magnetic resonance imaging in T2 (A and B) and T1 showing bilateral peripelvic and perirenal cysts hyperintense in T2, hypointense in T1. Notice the huge retroperitoneal collection sharing the same signal as the cysts.
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T1 sequences (Fig. 2).
Enhanced abdominal CT showing a total regression of the retroperitoneal collection after percutaneous drainage.
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Subsequent follow-up visits and computed tomography (Fig. 3) and sonography (Fig. 4) examinations showed improvement in the patient's clinical status and a total regression of the retroperitoneal collection.