Contralateral hyperhidrosis following lateral medullary infarction.

A 39-year-old woman presented with vertigo and difficulty controlling her right side. She had a right-sided Horner’s syndrome, gaze-evoked horizontal nystagmus with the fast-beating phase to the left, and right upper and lower limb ataxia with reduced temperature sensation to the left side of her face, arm and leg. MR scan of brain showed a right lateral medullary infarct secondary to a dissection of the right vertebral artery (figure 1). A week after her stroke, she noticed increased sweating on the left side of …