%0 Journal Article %T Intrasinusoidal bone marrow involvement in mantle cell lymphoma: a case series with review of the main differential diagnoses. %A Bonometti A %A Tzankov A %A Alborelli I %A Russkamp NF %A Dertinger S %A Dirnhofer S %J Virchows Arch %V 0 %N 0 %D 2024 Aug 6 %M 39107523 %F 4.535 %R 10.1007/s00428-024-03885-7 %X Intrasinusoidal bone marrow involvement is an infrequent histological pattern observed in a limited number of B and T cell lymphomas. Mantle cell lymphoma is a biologically and prognostically heterogeneous B cell lymphoma that frequently involves the bone marrow, with interstitial, nodular-paratrabecular, or diffuse patterns. Intrasinusoidal bone marrow involvement has been described only anecdotally in this lymphoma. Here, we describe the clinical, histopathological, and molecular features of four patients diagnosed with advanced-stage mantle cell lymphoma, showing intrasinusoidal bone marrow involvement, and other peculiar immunophenotypical features. As similar cases may represent a relevant issue in bone marrow diagnostic histopathology, we also reviewed the literature to discuss differential diagnoses of B and T cell lymphomas with intrasinusoidal bone marrow involvement.