Segmental porokeratosis developing after electron beam radiotherapy for follicular lymphoma has been reported once, to our knowledge, in the literature.1 However, the patient in that case could not recall which areas of skin were irradiated, so the association was open to question. We report a second case, which we think demonstrates the association even more convincingly.
Multiple erythematous scaly lesions, located in a segmental distribution in the natal cleft.
Skin biopsy specimen showing hyperkeratosis and parakeratosis without generalized dysplasia. The angulated column of parakeratin is associated with underlying hypogranulosis and dyskeratosis (cornoid lamella).
Radiotherapy planning image showing the single anterior (Ant) and 2 lateral (Lat) radiation fields used. The exit dose of the anterior field can be seen at the lower aspect of the image.
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