The Parry-Romberg syndrome (PRS), also known as hemifacial atrophy, is a rare neurocutaneous disease with the prevalence of 1/700,000 cases. It is more common in women than men, with an early onset of disease usually within the first two decades of life. Even though the etiology of PRS is unknown, it is thought to be a multifactorial disease that involves hereditary, posttraumatic, autoimmune, infectious, and neoplastic factors.
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