The biopsy specimen displayed a dense superficial and deep nodular perivascular infiltrate of medium-sized lymphocytes, many with nuclear irregularity and prominent nucleoli (Figure 3). Immunohistochemical evaluation demonstrated strong anti-CD3 and CD4 staining of all neoplastic cells. Anti-CD7 staining was diffuse but faint. Anti-CD8, CD20, T-cell leukemia/lymphoma 1 (TCL-1), and terminal deoxynucleotidyl transferase (TdT) did not stain neoplastic cells. Bacterial, mycobacterial, and fungal stains were all negative.