Fig. 2

Endoscopic and histologic findings of diffusely infiltrating type MEITL (a, b) and ATLL (c-f). a Endoscopic view of sigmoid colon showing mild edematous mucosa with small erosion. b Histological analysis showing small nests of atypical intraepithelial lymphocytes (IELs), preserved glands, and invasion by medium-sized atypical lymphocytes (hematoxylin and eosin stain, × 400). c Endoscopic view of cecum showing many aphthoid colitis-like lesions. d Histological analysis showing preserved glands, small nests of atypical IELs, and invasion by pleomorphic medium-sized atypical lymphocytes, × 400. e Endoscopic view of the descending colon showing reddish, mildly edematous mucosa. f Histological analysis showing invasion by small and medium-sized atypical lymphocytes, × 400