title: Ringlike rectal ulcers after biopsy or polypectomy.
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007417:Intestinal Polyps / Q000473:pathology / Q000601:surgery*; D008297:Male; D011183:Postoperative Complications; D012002:Rectal Diseases / Q000209:etiology*; D012004:Rectal Neoplasms / Q000473:pathology / Q000601:surgery*; D012007:Rectum / Q000473:pathology*; D014456:Ulcer / Q000209:etiology*