Fig. 1
From: Unusual gastric mucosal infiltration by a medullary thyroid carcinoma: a case report
a, b Endoscopic view of the gastric corpus mucosa. c Computed tomography demonstrating multiple small noduli within the stomach wall: I overview, noduli marked by white circle; II, III magnification, noduli marked by white arrows. d–h Histologic and immunohistochemical staining of gastric biopsy specimen. d Hematoxylin-eosin, overview. e Hematoxylin-eosin, detail. f Immunohistochemical staining for chromogranin A. g Immunohistochemical staining for calcitonin. h Immunohistochemical staining for carcinoembryonic antigen (CEA). Remarkably, histology reveals intact non-neoplastic gastric gland structures (marked by *) in between infiltrating cells