描述

The P3 segment of posterior cerebral artery (CPA) extends from the posterior edge of the lateral surface of the midbrain and ends at the point of origin of the parieto-occipital sulcus along the calcarine fissure, lying then along or inside the prox-imal part of the calcarine fissure. The P3 segment then includes the collicular point within the quadrigeminal cistern, which corresponds to the closest angiographic point between both PCAs in the anteroposterior view.


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