Urethral obstruction owing to retroperitoneal cystic lymphangioma

We report a case of cystic lymphangioma arising from retroperitoneal tissues of the pelvis, which caused urethral obstruction and eventual urinary retention. Sonography and computerized tomography demonstrated a retroperitoneal cystic mass in the pelvis. A preoperative diagnosis of retroperitoneal cystic lymphangioma was suggested by typical computerized and sonographic features.