Marcus-Gunn Jaw-Winking Phenomenon: A Case Report on Rare Oculofacial Synkinesis

The Marcus-Gunn jaw-winking phenomenon (MGJWP) is an uncommon congenital oculofacial synkinesis resulting from abnormal innervation between the fifth cranial nerve (trigeminal, CN V) and the third cranial nerve (oculomotor, CN III). This case report presents a 5-month-old girl with characteristic left eyelid elevation during suckling movements, highlighting the importance of clinical observation in early diagnosis. The condition was confirmed based on clinical findings, with no associated neurological or structural abnormalities. Management involved observation and follow-up to monitor potential complications such as strabismus or anisometropia. MGJWP remains an essential consideration in cases of unusual eyelid movement, emphasizing the role of multidisciplinary consultation for comprehensive care.