title: Roentgenographic diagnosis of pneumoperitoneum.
mesh_terms: D000005:Abdomen / Q000601:surgery; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008722:Methods; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging* / Q000209:etiology; D011029:Pneumoradiography; D011183:Postoperative Complications; D011187:Posture; D011247:Pregnancy; D011860:Radiography, Abdominal; D012737:Sex Factors