Progressive hemifacial atrophy (HFA) is a rare craniofacial disorder characterized by progressive atrophy of the skin, subcutis, muscles, and bone. Classified on a spectrum with frontoparietal linear morphea/en coup de sabre (ECDS), HFA occurs deep, with atrophy of the subcutis, muscle, and bone. Features of ECDS and HFA often coexist,1 and the 2 entities are considered variants of craniofacial localized scleroderma.2
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Jones KM, Tan JK, Alomari AI, et al. Early Features of Progressive Hemifacial Atrophy–Clinical and Imaging Findings. JAMA Dermatol. Published online July 22, 2020. doi:10.1001/jamadermatol.2020.2593
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