Abstract
A 73-year-old man underwent colonoscopy for fecal occult blood. A flat elevated lesion with slight depression measuring 7mm in diameter with converging folds was observed in the ascending colon. Biopsy was performed and pathological findings showed moderately differentiated adenocarcinoma. Colonoscopy performed 55 days after the initial colonoscopy showed that the lesion had disappeared and changed to a scar. Biopsy showed no carcinoma cells. As deep submucosal invasion was suspected based on the findings of the initial colonoscopy, laparoscopic right colectomy was performed 79 days after the initial colonoscopy. The resected specimen showed only a scar, and no cancerous tissue was found histologically. The colon cancer seems to have regressed spontaneously. The patient is alive with no evidence of recurrence 6 months after surgery.
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