title: Pneumoperitoneum in acute abdomen.
mesh_terms: D000006:Abdomen, Acute / Q000000981:diagnostic imaging* / Q000209:etiology; D000368:Aged; D012809:Colon, Sigmoid / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D004241:Diverticulum, Colon / Q000150:complications / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007416:Intestinal Perforation / Q000150:complications; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*; D011859:Radiography