"occlusion at the origin of the artery produces the classic presentation of ipsilateral cerebellar (ataxia, dysarthria, nystagmus) and brainstem (Horner’s syndrome) signs associated with a contralateral dissociated sensory impairment. Interestingly this was described initially by Mills over 100 years ago 5."
"peripheral occlusion presents with solely ipsilateral cerebellar signs."
"Important causes of cerebellar infarction include atherosclerosis, cardiogenic emboli, and vertebral/basilar artery dissections 2. Proximal occlusions of the superior cerebellar arteries are often due to dissection or thrombosis, with peripheral occlusion typically due to embolisation 3,4."