Photosensitive mycosis fungoides or actinic reticuloid?

We report two patients who satisfied the diagnostic criteria for actinic re ticuloid (AR) on initial presentation, in whom genotypic analysis of early skin biopsies failed to show T-cell gene receptor rearrangements. Both pati ents progressed to widespread skin involvement associated with histopatholo gical and genotypic features of mycosis fungoides (MF), Arguably, these pat ients may have had photosensitive MF from the outset, but their clinical fe atures, phototesting, and subsequent demonstration of a T-cell gene recepto r rearrangement in the skin could also suggest progression of AR to MF.