2002年以前に報告された日本人胃のHamartomatous inverted polyp（inverted hyperplastic polyp）の臨床病理学的所見の検討

Gastric hamartomatous inverted polyp （g-HIP） is rare gastric elevated lesion forming endophytic growth pattern which etiology remains unknown. G-HIP is said to be associated with gastric cancer and gastritis. We systematically reviewed Japanese g-HIP’s clinicopathological features reported before２００２. Japanese g-HIP amount to２０lesions,１８patients ; ７（３８．９％）were males and １１（６１．１％）were females. The mean age of patients was ６０．２ years old. The mean size of the lesions was２１．７millimeter. No of the polyp shape was Yamada type IV７, Yamada type I/flat elevation ６, Yamada type III ４ and Yamada II ３, respectively. The site of the lesions was Body１１, Cardia３, Fornix３and Antrum１, respectively. In１２described cases, accompanied lesion was Gastritis, Carcinoma, GCP, Hyperplastic polyp, GIST and remnant stomach due to ulcer. Of the submucosal shaped（Yamada type I/flat elevation）g-HIP,５０％ has GCP and６２．５％ has gastric cancer. The common feature of g-HIP was pyloric gland-like mucous gland proliferation and cystic dilatation in the H. pylori era of Japan.