Adult T-cell leukemia presenting a IIa + IIc-like lesion in the stomach on endoscopic examination.

A patient with gastric involvement of adult T-cell leukemia is reported. Endoscopically, it mimicked an early gastric cancer IIa + IIc, but had the nature of a submucosal tumor, and could be distinguished from carcinoma. It is very important to distinguish it from carcinoma because of the different mode of therapy.