Impacted bone fragment in the anal canal must not be overlooked as an unusual cause of acute anal pain. Eight cases of acute anal pain arising from impaction of ingested bone fragment within the anal canal were treated over a 4-year period. The eight cases were similar in presentation and outcome. There were six males and two females (age 45~65 years). Seven patients presented within a day of the sudden onset of severe anal pain, and one patient presented with obscure anal pain of three days. In two patients, this pain was aggravated by attempts to defecate. Inspection showed mild to marked spasm of the anal sphincter with no obvious cause for the anal pain. Digital rectal examination revealed spiculated bony fragments impacted in the anal canal at the dentate line in seven cases, and at the anorectal junction in one case. In one case, a fish bone was found penetrating into a hemorrhoid, causing edema and prolapse. In another case, a tiny fish bone was found impacting in a nylon seton applied to a fistulotomy wound. In a third case, a linear fish bone was found penetrating into an anal papilla. Six fish bones and one chicken bone were removed using forceps under proctoscopy. One fish bone was removed at the time of digital rectal examination. Sigmoidoscopy was then performed to assess anorectal injury. Pain relief was immediate, and no sequelae were noted on review at 6 weeks. In all cases, the diagnosis was readily made on simple digital rectal examination, and early removal of the bone fragment resulted in immediate pain relief without complications. Eight cases of acute anal pain due to impaction of ingested bone fragment in the anal canal are reported, and the related literature is reviewed.
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