Progressive Hemifacial Atrophy

**Semantic type:** Disease or Syndrome

**Definition:** A rare disorder of unknown etiology, which is characterized by slowly progressive, unilateral facial atrophy of the skin, soft tissue, muscles, and underlying bony structures. Neurological, ocular, and oral symptoms are also often seen, including migraines, trigeminal neuralgia, enophthalmos, and dental and gingival abnormalities.

**Synonyms:** - Parry-Romberg Syndrome - Parry-Romberg Syndrome