The angiographic sylvian point (ASP) is the most medial point where the last cortical MCA branch ( usually the angular artery) turns inferiorly to exit the sylvian fissure.
This point approximates the apex of the insula and represents the posterior limit of the lateral cerebral sulcus.
It is suggested to be the halfway point on the clinoparietal line (CPL) (CPL is the line between the anterior clinoid process and a pointon the skull roof situated 2 cm above the lambda or 8to9 cm obove the external occipital protrubarence).
It is seen in tha AP view.
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