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The causative lesions (hematoma in 7 and infarct in 9), unilateral in 15 patients and bilateral in 1, were located in the posterior two-thirds of the corona radiata, thalamocapsular and subthalamus regions, or cerebral peduncle. Ataxia of the cerebellar type was unilateral in 15 patients and bilateral in 1 with similar, deep, bilateral causative lesions. Four patients presented some characteristics of proprioceptive ataxia (mixed ataxia). Associated cognitive disturbances were present in 9 patients and absent in 7. Eleven of the 12 subjects studied by 133-Xenon inhalation technique showed limited centro-parietal hypoperfusion, mainly in the inferior parietal lobule, ipsilateral to the causative lesion and bilaterally in the patient with bilateral lesions and ataxia. Ipsilateral hypoperfusion was confirmed in 7\/9 patients studied by SPECT, which also demonstrated contralateral cerebellar hypoperfusion in 4 patients. These findings suggest that ataxic hemiparesis syndrome results from functional depression (diaschisis) consequent to the interruption at many levels of an \u201cinferior parietal associative cortex - cerebellar anterior lobe\u201d circuit.<\/jats:p>","DOI":"10.1017\/s0317167100048708","type":"journal-article","created":{"date-parts":[[2016,2,17]],"date-time":"2016-02-17T09:12:27Z","timestamp":1455700347000},"page":"15-23","source":"Crossref","is-referenced-by-count":5,"title":["Parieto-cerebellar Loop Impairment in Ataxic Hemiparesis: Proposed Pathophysiology Based on an Analysis of Cerebral Blood 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