Atrophy

Progressive hemifacial atrophy (progressive hemifacial atrophy) is also known as Parry-Romberg syndrome. It is a progressive dystrophic disease of unilateral tissues. A small number of lesions involve the limb or body. Its clinical feature is that chronic progressive atrophic muscle fibers of focal subcutaneous fat and connective tissue on one side of the face are not invaded by cartilage and bones. Most scholars believe that the disease is related to sympathetic nerve dysfunction, which causes damage to sympathetic nerves, causes neurotrophic disorders in facial tissues, and eventually causes facial tissue atrophy. Other theories involve local or systemic infection and injury, genetic degeneration of connective tissue disease of trigeminal neuritis.