Rare natural killer cell lymphoma found during surveillance endoscopy.

INTRODUCTION: Non-Hodgkin's lymphoma is the sixth leading cause of cancer death in the USA and comprises 2-3% of primary neoplasms. Natural killer (NK)/T cell lymphomas are subtypes of non-Hodgkin's lymphoma and are aggressive neoplastic disorders with frequent extranodal presentations. Clinically, most cases of aggressive NK cell lymphomas present in young males with massive hepatosplenic infiltration. The upper aerodigestive tract is the most common site of presentation. CASE REPORT: NK/T cell lymphomas are subtypes of non-Hodgkin's lymphoma and are aggressive. CASE DISCUSSION: Here we describe an unusual case of non-Hodgkin's NK/ T cell lymphoma of colon and stomach found during surveillance upper endoscopy followed by a subsequent colonoscopy.