Fig. 1

Case 1. Endoscopic appearance of a polypoid lesion in the gastric fundus (a). Mucosal Schwann cell hamartoma in the gastric mucosa. A poorly circumscribed spindle cell lesion with no significant atypia: b 40x magnification; c 100x magnification. Mucosal Schwann cell hamartoma in the gastric mucosa. Strong and diffuse immunohistochemical staining for S100 protein (100x magnification) (d)