Zosteriform mycosis fungoides: case report of progression to tumor stage and review of the literature.

Mycosis fungoides (MF) is the most common type of cutaneous T-cell lymphoma, although it has many clinicopathological variants. Zosteriform MF is an extremely rare variant characterized by dermatomal distribution. To date, only six patients with zosteriform MF have been reported. We report a 57-year-old man with tumor-stage zosteriform MF localized on the left T4, T7-8, and bilateral L4 dermatomes for seven years after the first visit. Local skin-target therapy radiotherapy effectively led to complete remission, which was maintained with a combination of oral etretinate (30mg/day) and narrow-band ultraviolet B phototherapy. No other reports exist of zosteriform MF occurring in multiple dermatomes. We reviewed the literature to add to our understanding of the nature of rare variants of MF and discuss therapeutic options for zosteriform MF.