Mycosis fungoides involvement of genitalia is rare. We present a 63-year-old man with history of cutaneous T cell lymphoma with large cell transformation status post multiple electron beam radiation cycles who presented with a new, enlarging penile mass. He underwent ultrasound, MRI, and excisional biopsy. Pathological results indicated hematogenous spread of T cell lymphoma with large cell transformation. Peri-operative radiation was performed, and the patient had significant reduction in penile mass size but some subsequent erectile dysfunction. In discussion of this case, we examine management of penile mycosis fungoides.
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