Subtentorial blood circulations caused by cerebral dislocations due to subtentorial tumors
To research the blood circulation disorders caused by cerebral dislocations in patients with tumors of the posterior cranial fossa, 147 patients with tumors, mentioned above, were examined. In 41 patients subtentorial circulatory disorders caused by the dislocation of structures of the posterior cranial fossa were found. These discirculations led to alternating syndromes, in which the brain stem and cerebellum damages on the opposite side to neoplasm were observed. The results of neurological examination, magnetic resonance angiography and dynamic of symptoms proved the genesis of vascular disorders mentioned above. Circulatory disorders on the opposite side to neoplasm were observed in the basin of the superior cerebellar artery most frequently. Such disorders were rare in the basins of the anterior and posterior inferior cerebellar arteries. Vascular disorders in the majority of cases regressed quite rapidly when tumor had been removed. Palliative operations to reduce intracranial pressure led to a slight and short regression of symptoms.