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A case of familial inverse Marcus Gunn phenomenon
  1. J Y Oh,
  2. J E Kim,
  3. Y J Kim,
  4. K D Park,
  5. K G Choi
  1. Department of Neurology, College of Medicine, Ewha Womans University, 911-1, Mok-dong, YangCheon-ku, Seoul 158-710, Korea
  1. Correspondence to:
    Dr Jee-Young Oh;
    serein02{at}ewha.ac.kr

https://doi.org/10.1136/jnnp.74.2.278

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    Inverse Marcus Gunn phenomenon is a rare congenital synkinetic movement presenting as eyelid drooping on jaw opening. It has only rarely been reported.1 Often this phenomenon follows peripheral facial palsy,2 suggesting abnormal synkinesis of the facial nerve. However, the precise mechanism remains uncertain. Only one electromyographic study has been reported in this condition.3 In that case, trigemino-oculomotor synkinesis was the supposed mechanism, rather than trigemino-facial synkinesis. We report a patient with familial inverse Marcus Gunn phenomenon and speculate on the neuronal mechanism with the support of electromyographic results.

    A 31 year old woman visited our clinic complaining of involuntary winking of her left eyelid on jaw opening. The symptom was most prominent when she opened her mouth forcefully, …

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