title: A new method of localize the choroid point of the PICA and the venous copular point on the lateral projection of vertebral angiography.
abstract: The location of the choroid arterial point as well as of the copular venous point with reference to a line, dealing with the anatomical structure at the level of the cervicooccipital joint, was found to be a quick and accurate method for the diagnosis of tonsillar herniation. The application of this method has the advantage of giving the location of the choroid arterial point, and a control of the venous time of arteriography by the location of the copular point.
mesh_terms: D002531:Cerebellum / Q000098:blood supply; D002533:Cerebral Angiography / Q000379:methods*; D004677:Encephalocele / Q000000981:diagnostic imaging; D006801:Humans