Endoscopic images of NK-cell enteropathy. (A-B) Colonic lesions. The colonic lesions generally appeared as ulcers with surrounding erythema and edema (A), but some lesions had a more nodular or polypoid appearance (B). (C-D) Gastric and duodenal lesions. The main lesions noted were raised ulcer-like lesions surrounded by erythema and edema (duodenal lesion; C); a few small punctuate deep ulcers in the stomach (D) were also noted and had similar pathologic appearance as the other NK-cell lesions throughout the gastrointestinal tract. Images were processed with Adobe Photoshop.