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Start free with EleplanInverse Marcus-Gunn phenomenon
ORPHA:98951Clinical subtype
What it is
Inverse Marcus-Gunn phenomenon is a rare congenital synkinesis where jaw opening by the pterygoid muscle (during eating or yawning) causes eyelid drooping from inhibition of the oculomotor nerve to the levator palpebrae superioris. Familial occurrence has been reported.
Key facts
- Classified as
- Clinical subtype
Recorded for the broader condition
- Age of onset
- Infancy, NeonatalMarcus-Gunn syndrome
- Inheritance
- Autosomal dominantMarcus-Gunn syndrome
Orphanet records these for the broader condition rather than for this specific form. They are a starting point, not a figure for this subtype — subtypes often differ, and some are defined by being rarer than the condition they sit under.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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