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Repeated facial palsies after chlorocresol inhalation.
  1. M Døssing,
  2. C H Wulff,
  3. P Z Olsen

    Abstract

    A 42-year-old woman who experienced more than 50 attacks of left-sided facial palsies after exposure to chlorocresol was studied. Only muscles around the left side of the mouth were affected. On neurophysiological testing during chlorocresol provocation the only abnormality was a loss of motor units during maximal contraction of the left orbicularis oris muscle. This could be explained by a peripheral as well as a central effect. Extensive electrophysiological examination without chlorocresol provocation excluded a preexisting generalised nerve disorder and other diagnostic procedures did not give evidence of pathology involving the left facial nerve. A hyperreactive mechanism causing a transient block of the left facial nerve is proposed.

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