title: Hyperplastic polyp causing ball-valve effect.
authors.forename: Y
authors.initials: Y
authors.lastname: Sone
authors.forename: T
authors.initials: T
authors.lastname: Honda
authors.forename: S
authors.initials: S
authors.lastname: Nakano
mesh_terms: D004724:Endoscopy; D006801:Humans; D006965:Hyperplasia; D008297:Male; D008875:Middle Aged; D011127:Polyps / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery