Ocular neuromyotonia

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Abstract
Ocular neuromyotonia was diagnosed in a middle-aged female who had previously undergone surgery and irradiation for an infiltrating pituitary adenoma. Despite a normal ocular motility pattern, at times she experienced transient vertical diplopia and left eyelid retraction. For the duration of the episodes she exhibited impairment of elevation and depression of the left eye. This paroxysmal spasm was considered to reflect simultaneous activation of the superior and inferior rectus muscles and the levator palpebrae superioris. Episodic inappropriate contraction of these three muscles has not been previously described. She responded well to carbamazepine, a membrane stabilizing medication.

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