Parry Romberg Syndrome.

Parry-Romberg syndrome, or progressive hemifacial atrophy, is a rare disorder of unknown etiology. Patients present with unilateral atrophy of skin that may progress to involve underlying fat, muscle, and osseocartilaginous structures. Neurologic complications are common. After self-limited disease stabilization, various reconstructive options may be used to restore patients' facial symmetry. Serial autologous fat grafting has shown favorable results in reconstruction of mild or moderate soft tissue deficiency, but free tissue transfer remains the treatment of choice for severe disease.