CEREBRAL VASCULAR LESIONS AND THE TENTORIAL PRESSURE CONE.

HERNIATION through the incisura tentorii as the result of increased intracranial pressure has been emphasized recently by several observers, notably Geoffrey Jefferson (1938) and Moore and Stern (1938), as the anatomical basis for some organic nervous symptoms. This lesion is generally regarded as being especially prone to occur with abscesses involving the temporal lobe, but it has been noted in association with tumours of this region and of other parts of the brain. The present case is an example of such a herniation in which the structural changes have been especially studied, and in particular the altered relations of the posterior cerebral artery to the edge of the tentorium cerebelli.