Fig. 2. Microscopic findings. (A) Endoscopic biopsy specimens show a diffuse and dense infiltration of small-sized lymphocytes and a lymphoepithelial lesion in the colonic mucosa (H&E staining, ×400). (B) Immunohistochemical staining shows infiltrative small-sized lymphocytes with positive for B-cell marker CD20 (×400).

Korean J Gastroenterol 2020;76:327~330 https://doi.org/10.4166/kjg.2020.126

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