Cutaneous gamma/delta T-cell lymphoma: a histopathologic mimicker of lupus erythematosus profundus (lupus panniculitis).

In the newly revised World Health Organization (WHO)-European Organization for Research and Treatment of Cancer (EORTC) consensus classification for cutaneous lymphomas, cutaneous gamma/delta T-cell lymphoma (CGD-TCL) has been included as a provisional entity. This type of lymphomas, when involving the subcutaneous fat, can mimic both clinically and histologically other more indolent conditions, such as subcutaneous panniculitic T-cell lymphomas (SPTCL) and lupus erythematosus profundus (LEP), and multiple biopsies may be needed to obtain a correct diagnosis. A good correlation of the clinical data with the histopathology and immunohistochemistry are required for diagnosis. Herein, we describe a patient whose initial histopathologic findings ressembled LEP but presented an aggressive clinical course. A new biopsy was performed during the follow-up, and a final diagnosis of CGD-TCL was made.