Liver biopsy pathology and histochemistry (hematoxylin-eosin staining,). (a) and (b) Heteromorphic lymphocytes were observed in the hepatic sinusoid and portal area. The nuclei were round or oval. The cells presented with one or multiple nucleoli. The nuclear mitotic figure was common, low, and high magnifications (×4, ×40, resp.). (c) BCL-6 was diffusely strongly positive. (d) CD20 was diffusely strongly positive.