[Folliculotropic mycosis fungoides. Study of four cases].

Folliculotropic mycosis fungoides is a variant of mycosis fungoides characterized by the presence of folliculotropic infiltrates, often with sparing of the epidermis, and preferential involvement of the head and neck. We report our experience with four cases of folliculotropic mycosis fungoides followed in our department in the last years. There are four patients (three men and one woman) aged 45 to 68 years. Clinically the lesions presented as cysts, comedones, follicular papules and plaques with follicular plugging. The histopathological study showed a peri and intrafollicular infiltrate with partial or total sparing of the epidermis. This infiltrate was mainly composed of atypical lymphocytes. Some cystic formations were also observed. Three cases showed mucin deposits and one showed syringotropism. The immunohistochemical analysis was positive for CD3, CD5 and CD4. All patients received different treatments based on the stage of their disease. One of them died of septic shock and the rest showed partial responses and frequent relapses.