Abstract
The anatomy of the posterior cerebral artery (PCA) and its branches is described. On the vertebral angiogram, displacement of these vessels is a sign of corresponding displacement of the temporal horn, which in turn is an indication of a mass involving the temporal lobe, diencephalon, or midbrain. Specific angiographic criteria for localization of the temporal horn include (a) the position of the lateral choroid artery (LCA) as it runs within the choroidal fissure; (b) the temporal branches of the PCA as they cross the parahippocampal gyrus and pass into the collateral sulcus; and (c) the crural and ambient segments of the PCA as they pass around the midbrain.
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