A Retroperitoneal Serous Cystadenoma of Müllerian Origin Masquerading as a Massive Renal Cyst

2017 
A 78-year-old woman presented to the urology clinic with a large, symptomatic left-sided abdominal cyst that was believed to be renal in etiology for many years and that had been percutaneously drained 3 times previously with persistent regrowth. The patient underwent laparoscopic resection of this mass, which proved to be a completely distinct retroperitoneal cystic structure and was not renal in nature. Pathologic analysis ultimately revealed a rare occurrence: a benign retroperitoneal Mullerian serous cystadenoma. To our knowledge, this is the first report of such an entity “disguised” as a renal cyst.
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