Primary gastric T-cell lymphoma is very rare. Only a few cases have been reported in the literature. Moreover, Epstein-Barr virus-associated primary gastric T-cell lymphoma is extremely rare. We report a case of Epstein-Barr virus-associated primary gastric T-cell lymphoma, which showed rapidly progressive endoscopic features. Three esophagogastroduodenoscopic examinations in a 26-day period revealed different findings at different locations. The lymphoma cells were positive for UCHL-1, but negative for L26 and Ki-1 in immunohistochemical staining. (Korean J Gastrointest Endosc 19: 438∼442, 1999)