The acute abdomen.
D000006:Abdomen, Acute / Q000175:diagnosis / Q000209:etiology / Q000662:veterinary*; D000818:Animals; D002371:Cat Diseases / Q000175:diagnosis* / Q000209:etiology; D002415:Cats; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis* / Q000209:etiology; D004285:Dogs