Myasthenic facies
Pronunciation: my-as-THEN-ik FAY-sheez
Characteristic facial appearance in myasthenia gravis patients, featuring bilateral ptosis, weak facial expression, and difficulty maintaining eye closure.
Full Definition
Myasthenic facies refers to the distinctive facial appearance observed in patients with myasthenia gravis, particularly during periods of muscle fatigue. The clinical presentation includes bilateral ptosis that worsens throughout the day, weak or absent facial expression giving a 'mask-like' appearance, difficulty maintaining complete eye closure, and often a characteristic 'snarl' when attempting to smile due to preferential weakness of lower facial muscles. This facial pattern is diagnostically significant and should be carefully documented during clinical examinations, as it may be the presenting feature of generalized myasthenia gravis.
Usage
Usage note: Document the degree of ptosis and fatigability. Note diurnal variation in severity.
In Context
- "The patient demonstrated classic myasthenic facies with bilateral ptosis and inability to sustain eye closure for more than 10 seconds." — Neurological examination
- "Myasthenic facies became more pronounced during the afternoon clinic visit, supporting suspicion of neuromuscular junction disorder." — Follow-up assessment