title: Postoperative collections.
mesh_terms: D000006:Abdomen, Acute / Q000175:diagnosis*; D000038:Abscess / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D004322:Drainage; D006801:Humans; D008297:Male; D011183:Postoperative Complications; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography