Primary cutaneous diffuse large B-cell lymphoma, leg type. (A) Cohesive sheets of large transformed cells with prominent nucleoli. Strong expression of BCL2 (B), IgM (C), and MYC (D) may facilitate differentiation from PCFCL. Original magnification ×400 (A, hematoxylin and eosin stain) and ×200 (B-D, immunoperoxidase stain).