Zygomatic-frontal subluxation is a typical symptom of lateral facial atrophy, also known as Parry-Romberg syndrome. It is a progressive unilateral dystrophic disorder of the facial tissues, with a few lesions extending to the limbs or trunk, called progressive hemilateral atrophy. The diagnosis is based on the specific facial morphology and imaging changes of the disease. The diagnosis is not difficult when the patient presents with typical unilateral facial atrophy, especially subcutaneous fat atrophy, occasionally spreading to the cranium, neck and shoulders and limbs without affecting muscle strength. Differential diagnosis only in the early stages need to be distinguished from the following diseases: 1, congenital lipodystrophy This disease mainly manifests trunk, limbs or face scattered distribution of fat atrophy snipe autosomal recessive inheritance starts in infancy often complicates vulvar hypertrophy sweating, head hirsutism black acanthosis. Later development of diabetes can appear liver, kidney insufficiency or cardiac hypertrophy, as well as the combination of acromegaly. 2, limited scleroderma The initial stage of the disease may produce confusion, but the head and face is not a good site for scleroderma and skin scleroderma and the following tissue adhesions are very tight and not easy to pinch up snipe, but also no scar-type distribution can help to distinguish. It should be distinguished from spinal cavernous disease, amyotrophic lateral sclerosis, and myotonic dystrophy.