title: Retroperitoneal cystic lymphangioma presenting as an unusual pelvic mass.
mesh_terms: D003558:Cystoscopy; D003937:Diagnosis, Differential; D006801:Humans; D008202:Lymphangioma / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D010386:Pelvic Neoplasms / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D001743:Urinary Bladder / Q000000981:diagnostic imaging; D014567:Urography