Fig. 1

Radiologic and gross features of the retroperitoneal mucinous cystadenoma. A, B, Abdominal and pelvic CT scans showing a well-circumscribed retroperitoneal cystic lesion measuring 11 × 17.6 cm, with thin walls, no solid enhancing components, and no invasion of adjacent structures—features consistent with a benign lesion; C,Gross specimen after excision, revealing a unilocular cyst with a smooth external surface and a thickened base