Abstract
A 60-year old woman consulted our hospital complaining abdominal pain, diarrhea andbloody stool. Colonoscopic findings showed protruding type polyps with white exudate on their top, located from the transverse to the sigmoid colon. Biopsy specimens and endoscopicalInucosal resection fragments showed fibromuscular obliterations. Thrus we could make adiagnosis of cap polyposis. Herpes simplex virus-1 infection was proved and may be one of thernodification to induce cap Polyposis.