Tingling around the mouth, dysarthria, nystagmus, diplopia, ataxia, and vertigo with possible drop attack describes which vascular syndrome?

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These signs point to ischemia in the brainstem and cerebellum supplied by the vertebrobasilar system. Tingling around the mouth along with dysarthria, nystagmus, diplopia, ataxia, and vertigo reflect brainstem and cerebellar involvement, while a transient episode with a possible drop attack fits a transient ischemic attack in the basilar artery territory. Basilar artery TIAs are a form of posterior circulation TIA and are known for brainstem symptoms rather than cortical ones. In contrast, carotid TIAs typically produce unilateral weakness or speech/facial deficits and monocular vision loss, not the cluster of brainstem/cerebellar signs described. Transitory global amnesia would present mainly as sudden onset amnesia without these focal brainstem features.