Unilesional (segmental) mycosis fungoides presenting in childhood.

Mycosis fungoides is rare in children, and a unilesional presentation is also rare. A 13-year-old Kuwaiti boy with unilesional mycosis fungoides is described. Clinically he had a single indurated large plaque on the left shoulder with histopathologic features typical of cutaneous T-cell lymphoma. The diagnosis was further supported by the presence of a T-cell clone discovered through molecular biology studies of paraffin-embedded material. No other lesions were detected. The lesion showed a favorable response to local radiotherapy.