title: Leiomyoma of the sigmoid colon with perforation into the retroperitoneal space.
mesh_terms: D000368:Aged; D012809:Colon, Sigmoid; D003110:Colonic Neoplasms / Q000150:complications*; D006801:Humans; D007889:Leiomyoma / Q000150:complications*; D008297:Male; D012187:Retroperitoneal Space; D012422:Rupture, Spontaneous