title: Pneumoperitoneum associated with Escherichia coli peritonitis: a report of two cases.
mesh_terms: D000006:Abdomen, Acute; D004927:Escherichia coli Infections / Q000150:complications*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010538:Peritonitis / Q000150:complications*; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging / Q000209:etiology*; D011859:Radiography