Large fecal stones--the sigmoid.
D000368:Aged; D012809:Colon, Sigmoid; D003108:Colonic Diseases / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005244:Fecal Impaction / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D012811:Sigmoid Neoplasms / Q000000981:diagnostic imaging