ALK and diffuse large B-cell lymphoma: Differential diagnosis needs to take other aggressive hematological malignancies with a plasmablastic morphology into consideration, which may involve the skin, including PM, extracavitary primary effusion lymphoma (EC-PEL), EBV-positive diffuse large B-cell lymphoma, not otherwise specified (DLBCL, NOS), and anaplastic lymphoma kinase positive large B-cell lymphoma (ALK-positive LBCL) [21,45,59,60,61,62].