Fig. 3

Histological features of case 6. A depressed lesion was found in the center of the section (a) and the low magnitude feature [red box in (a)] was demonstrated in (b). The histologic features of a higher magnitude mucosal signet ring cell carcinoma (yellow box) and a poorly differentiated adenocarcinoma in the deep invasive portion (blue box) are shown in (c) and (d), respectively (hematoxylin and eosin staining)