Spindle‐cell variant of primary cutaneous follicle center lymphoma spreading to the hepatobiliary tree, mimicking Klatskin tumor

Primary cutaneous follicle center lymphoma ( pcFCL ) is an indolent type of primary cutaneous B‐cell lymphoma ( pcBCL ) rarely disseminating to other organs. PcBCL with spindle‐cell morphology has been described as a rare variant of pcFCL but the prognosis data of this variant is sparse. We report a rare case of spindle‐cell pcFCL with CD20 + , CD79a + , CD3 + , Bcl‐6 + , Mum‐1 − and CD10 − tumor cells that infiltrated the hepatic hilum, mimicking a Klatskin tumor. On the basis of the sparse published data on spindle‐cell morphology of pcBCL , this growth pattern should elicit awareness of an increased risk of systemic involvement in the otherwise indolent pcFCL .