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Marcus Gunn Jaw Winking Syndrome Explained

Marcus Gunn Jaw Winking Syndrome is a rare congenital condition in which jaw movements cause involuntary lifting of the upper eyelid. It is a neuro-ophthalmological abnormality present from birth.

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Things worth knowing about "Marcus Gunn Jaw Winking Syndrome"

Marcus Gunn Jaw Winking Syndrome is a rare congenital condition in which jaw movements cause involuntary lifting of the upper eyelid. It is a neuro-ophthalmological abnormality present from birth.

What Is Marcus Gunn Jaw Winking Syndrome?

Marcus Gunn Jaw Winking Syndrome (also referred to as Marcus Gunn Syndrome or trigemino-oculomotor synkinesis) is a rare congenital neuro-ophthalmological condition. It is characterized by an abnormal neural connection between the fifth cranial nerve (trigeminal nerve), which controls the muscles of chewing, and the third cranial nerve (oculomotor nerve), which innervates the levator palpebrae superioris muscle that raises the upper eyelid. As a result, movements of the lower jaw -- such as opening the mouth or chewing -- cause an involuntary elevation of the upper eyelid on the affected side.

The condition was first described in 1883 by the British ophthalmologist Robert Marcus Gunn. It is estimated to account for approximately 2 to 13 percent of all cases of congenital ptosis and almost always affects only one eye (unilateral).

Causes

The exact cause of Marcus Gunn Jaw Winking Syndrome is not fully understood. It is believed to result from aberrant (misdirected) innervation occurring during fetal neurological development. Nerve fibers from the trigeminal nerve -- normally intended to supply the chewing muscles (particularly the external pterygoid muscle) -- are mistakenly connected to the levator palpebrae superioris muscle of the upper eyelid.

In the majority of cases, the syndrome occurs sporadically, without a family history.
Rare familial cases have been reported, suggesting a possible genetic component.
The condition is slightly more common on the left side and affects males and females equally.

Symptoms

The hallmark symptom of Marcus Gunn Jaw Winking Syndrome is jaw winking: the upper eyelid rises involuntarily when the jaw is moved. Common triggers include:

Opening the mouth
Chewing or biting
Moving the jaw sideways
Sucking (particularly noticeable in infants)

Other frequently associated findings include:

Congenital ptosis: The affected upper eyelid droops at rest.
Amblyopia (lazy eye): Can develop if the drooping eyelid covers the pupil and visual development is disrupted, especially if treatment is delayed.
Strabismus (squint): Occurs in a proportion of affected individuals.
Bilateral involvement is rare but has been reported.

Diagnosis

The diagnosis of Marcus Gunn Jaw Winking Syndrome is primarily clinical, based on direct observation of the characteristic eyelid movement during jaw motion. No specific laboratory test is required. The diagnostic work-up typically includes:

Clinical examination by an ophthalmologist or pediatrician: Observing the jaw-winking reflex during various jaw movements.
Visual acuity testing and assessment of visual development to detect amblyopia at an early stage.
Ocular motility assessment to rule out strabismus.
Neuroimaging (e.g., MRI of the brain) may be used in atypical cases to exclude other neurological causes.

Treatment

Not all patients require treatment. The decision depends on the severity of the ptosis, the degree of jaw winking, and the risk of amblyopia development.

Conservative Management

In mild cases where the visual axis is clear and amblyopia is not a concern, a watchful waiting approach with regular ophthalmological follow-up may be appropriate. If there is a risk of amblyopia, occlusion therapy (patching) of the stronger eye is used to stimulate the weaker eye and support normal visual development.

Surgical Treatment

Surgery is indicated when ptosis is significant or jaw winking is cosmetically or functionally disruptive. The most common surgical options include:

Levator resection or weakening: A procedure targeting the levator palpebrae muscle on the affected side.
Bilateral levator denervation with frontalis suspension: In this approach, the levator muscle is divided on both sides and the eyelid is suspended from the frontalis (forehead) muscle using a sling material. This is the most widely recommended surgical technique as it effectively eliminates jaw winking and achieves a symmetrical cosmetic result.

The optimal timing for surgery is generally between the ages of 3 and 5 years, once visual development is largely complete and the child can better tolerate postoperative care.

Prognosis

With timely diagnosis and appropriate treatment, the prognosis is generally favorable. The greatest risk is the development of amblyopia, which can permanently impair vision if left untreated. Following successful surgery, many patients achieve a good cosmetic and functional outcome. Regular follow-up appointments with an ophthalmologist remain important even after surgical intervention.

References

Sinha S, Bhattacharyya D. Marcus Gunn Jaw Winking Synkinesis. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2023. Available at: https://www.ncbi.nlm.nih.gov/books/NBK554550/
Traboulsi EI (ed.). Genetic Diseases of the Eye. 2nd ed. Oxford University Press; 2012.
Yanoff M, Duker JS (eds.). Ophthalmology. 5th ed. Elsevier; 2019.

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