Mantle cell lymphoma (MCL) commonly involves extranodal sites, usually as a manifestation of disseminated disease. In rare cases, MCLs may arise as a primary tumor in the skin. Blastoid mantle cell lymphoma (BV-MCL) is a rare variant and has a more aggressive clinical course. The phenotype of BV-MCL is characterized as CD20+, CD5+, cyclin D1+, CD23−, and CD10−. Interphase fluorescence in situ hybridization shows a characteristic t(11;14) fusion pattern. We report a case of a BV-MCL arising in skin as primary cutaneous MCL with the characteristic immunophenotype and translocation.
From the *Pathology Reference Laboratory, Botucatu, São Paulo, Brazil; †Department of Dermatology, University of São Paulo Medical School, São Paulo, Brazil; and ‡Clínica de Hematologia de São Paulo, São Paulo, Brazil.
Reprints: Carlos E. Bacchi, MD, PhD, Consultoria em Patologia, Rua Major Leônidas Cardoso, 739, Botucatu, São Paulo, 18602-010, Brazil (e-mail: firstname.lastname@example.org).