Abstract
This paper presents a case of cap polyposis which is a new concept of the disease. A 21-year-old man was admitted to the hospital because of bloody stool lasting for over recent 3 years. He had been suspected having a villous tumor at the rectum by other doctor. He had a past history of undergoing a rectal polypectpmy with the chief complaint of bloody stool at the age of 14. Barium enema showed a whole circumferential lesion covering about 6-7cm from the anal verge and multiple elevated lesions on its surface. Colonoscopy showed multiple polypoid lesions covered with whitish exudate with intervening normal mucosa. In a histopathological examination of the specimens obtained by a transanal polypectomy, it was covered with a ‘cap’ of fibrous granulative tissue and diagnosed as inflammatory hyperplastic polyp. Based on these findings, we diagnosed the case as cap polyposis and dicided to observe conservatively. Thereafter his symptom almost vanished and no aggravation was revealed at a follow-up examination conducted 2 months after the treatment.
