Laryngeal nasal-type NK/T-cell lymphoma relapsing as perforation of the terminal ileum (case no. 33). (A) The small bowel mucosa shows extensive necrosis and ulceration in the right field. There is also transmural lymphomatous infiltration. Note the vascular occlusion by lymphoma (arrow). (B) Higher magnification shows large and medium-sized lymphoma cells with irregular nuclear contours. The chromatin is fairly dense.