In 1998, Tazawa and Tsutsumi (47) described a peculiar, localized accumulation of plasma cells with cytoplasmic Russell bodies
(Mott cells) in the lamina propria of the gastric mucosa, which can cause raised polypoid lesions; they named it Russell bodies
Microscopically, the fragments were covered by stratified nonkeratinizing squamous mucosa containing a dense subepithelial infiltrate of plasma cells with numerous Russell bodies
, occasional neutrophils, and large foamy histiocytes (Figures 2 and 3).
The underlying submucosa revealed a diffuse granulomatous inflammation (Figure 1) with numerous plasma cells, some of which contained Russell bodies