Mycosis Fungoides and Sézary Syndrome

Mycosis fungoides (MF) and the Sézary syndrome are a group of extranodal non-Hodgkin's lymphomas of T-cell origin with primary cutaneous involvement. The group distinguishes itself from other primary cutaneous T-cell lymphomas (CTCLs) by its unique clinical features and histopathology. In its early stages, it often resembles common benign dermatoses, and therefore, a definitive diagnosis can be delayed. The affected T cells are characterized by a predominant CD4+ phenotype with frequent loss of CD7 (pan-T-cell antigen) and often demonstrate T-cell receptor (TCR) rearrangement. The prognosis of patients with MF is highly dependent on the extent and type of skin involvement. The initial cutaneous presentation of…