Fig. 4From: Primary extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue with multiple pure ground-glass opacities: a case report a Pathological findings revealed tumor cells that were located in alveolar interseptal spaces. The alveolar walls remained intact. b Tumor cells showed slight atypia with hyperchromatic nuclei. Lymphoepithelial lesions were observed in the specimen. c Tumor cells were positive for CD20 expression. d Tumor cells were positive for BCL2 expressionBack to article page