title: The roentgenologic demonstration of tiny amounts of free intraperitoneal gas: experimental and clinical studies.
mesh_terms: D000006:Abdomen, Acute / Q000000981:diagnostic imaging; D005740:Gases; D006801:Humans; D007274:Injections, Intraperitoneal; D008722:Methods; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*; D011859:Radiography; D013679:Technology, Radiologic
chemical_list: D005740:Gases