A syndrome due to infarction of the dorsolateral rostral medulla, most often due to occlusion of the vertebral artery and less often occlusion of the posterior inferior cerebellar artery (PICA). Clinical findings on the side of the lesion include – loss of pain and temperature from the face, limb ataxia, falling to side of lesion, vertigo, nausea, vomiting, nystagmus, Horner's syndrome (miosis, ptosis, anhidrosis), pharyngeal paresis with dysphagia, partial paralysis of vocal cord with hoarseness, diminished gag reflex; on side opposite lesion-impaired pain and thermal sense over half the body.