Abstract
Up to date 119 cases of juvenile polyp have been reported in Japan. We recently ex-perienced seven cases. We devided all of the 126 cases into two groups; a child group under 15 years of age, and an adult group of 15 years and older. The child group with average age of 3.7 years consisted of 107 cases (84.9%), and the adult group with average age of 23.8 years consisted of 19 cases (15.1%). The age distribution of patients had two peaks. A higher peak was observed about 3-4 years of age, and a lower peak was about 20 years of age. After that the incidence of juvenile polyp decreases with age. Among these two groups, there was no significant difference about the location of polyps, sex ratio and symptoms. Neither histologically nor in macroscopic appearances, any difference was observed between these two groups. But polyps in the adult group showed a tendency to be smaller in size and with shorter duration of symptoms than in the child group. We discussed the pathogenesis of juvenile polyp from the clinicopathological aspect, but were not able to make it clear.
