ALK and primary effusion lymphoma: In the current WHO classification, there are distinct lymphomas with plasmablastic morphology and immunophenotype to be considered in the differential diagnosis with PBL, including EC-PEL, EBV-positive DLBCL, NOS, BL, anaplastic lymphoma kinase positive large B-cell lymphoma (ALK-positive LBCL) and plasmablastic myeloma (PM) [8,61,62,63].