title: Gastric inverted hyperplastic polyp. Report of four cases and relation to gastritis cystica profunda.
abstract: Gastric inverted hyperplastic polyp (IHP) is a rare type of gastric polyp, and is characterized by downward growth of the hyperplastic mucosal components into the submucosa. To the best ofour knowledge, 16 gastric IHP cases have been described in the English literature, but the pathogenesis has not been established. We report the clinical and pathological findings of four gastric IHP cases. The lesions were mainly composed of hyperplastic foveolar-type glands with focal cystic dilatation. Pyloric type glands, endocrine cells, acinic cell metaplasia, and smooth muscle bundles were also seen as components of the polyp. Two cases (cases 1 and 4) coexisted with multifocal gastritis cystica profunda (GCP) and gastric adenocarcinoma. Case 4 furthermore exhibited an intermediate form between IHP and GCP. We suggest that IHP may be GCP associated with exaggeratedly hyperplastic and metaplastic changes. In case 4, the coexisting gastric carcinoma was mainly located in the submucosa, whilst the mucosal component was minimal. Five out of twenty reported gastric IHP cases, including our cases, coexisted with gastric adenocarcinoma. These facts would lead us to further investigate the relation between gastric IHP and carcinoma.
authors.affiliation: Department of Pathology, University of Tokushima School of Medicine, Tokushima, Japan. riko@basic.med.tokushima-u.ac.jp
authors.forename: Michiko
authors.initials: M
authors.lastname: Yamashita
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Hirokawa
authors.forename: Masahiko
authors.initials: M
authors.lastname: Nakasono
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kiyoku
authors.forename: Nobuya
authors.initials: N
authors.lastname: Sano
authors.forename: Masahiko
authors.initials: M
authors.lastname: Fujii
authors.forename: Takashi
authors.initials: T
authors.lastname: Koyama
authors.forename: Sadahiro
authors.initials: S
authors.lastname: Yoshida
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Sano
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology; D005756:Gastritis / Q000473:pathology*; D006801:Humans; D006965:Hyperplasia; D008297:Male; D008875:Middle Aged; D011127:Polyps / Q000473:pathology*; D013274:Stomach Neoplasms / Q000473:pathology*