ALK and diffuse large B-cell lymphoma: Differential diagnostic considerations for PBM include lymphoid neoplasms with plasmablastic, immunoblastic, or plasmacytoid features, such as diffuse large B‐cell lymphoma (DLBCL), HHV‐8 DLBCL‐NOS, ALK‐positive large B‐cell lymphoma, primary effusion lymphoma, and plasmablastic lymphoma (PBL) [2].