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Folliculotropic Mycosis Fungoides as a Posttransplant Lymphoproliferative Disorder. Posttransplant lymphoproliferative disorder (PTLD) is a known complication of solid organ transplantation. The majority are B cell in origin and related to Epstein-Barr virus infection. T-cell PTLD is much less common; most are Epstein-Barr virus negative and have a worse prognosis. Primary cutaneous T-cell lymphoma (CTCL) as a presentation of PTLD is rare. CTCL has a less favorable prognosis in transplant patients compared with that in immune-competent patients. Herein, we report a case of a 13-year-old boy who developed folliculotropic mycosis fungoides, a rare subtype of CTCL, subsequent to renal transplantation. To our knowledge, this is the first report of this type of PTLD in a pediatric patient.