Gastric Polyp: Inflammatory Fibroid Polyp, Hyperplastic Polyp, and Inverted Hamartomatous Polyp

Abstract

Inflammatory fibroid polyps (IFPs) are rare mesenchymal lesions in which histologically spindle cells proliferate in the submucosal layer [1, 2]. Despite occurrence of IFPs throughout the gastrointestinal tract, they are most commonly found in the gastric antrum (66–75%) [3]. IFPs are generally considered benign, noninvasive lesions [1, 2], and they were previously considered reactive lesions [4]. But recently, IFPs have been considered as neoplastic lesions with gene mutation, which are basically not invasive [5]. Very few cases of gastric IFPs have been reported to invade the muscularis propria layer as well [6, 7].