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Transdifferentiation of follicular lymphoma to a Langerhans cell neoplasm is rarely reported and not well understood. Here we present a case, review the literature and discuss some of the biological underpinnings of lineage switch of B cells to histiocytes/Langerhans cells. A 31-year-old woman had follicular lymphoma (FL) and Langerhans cell sarcoma (LCS) co-localized above and below diaphragm. The FL was low-grade, had typical morphologic features, and was positive for CD10, BCL-2, and BCL-6. The LCS was cytologically atypical with nec