Intracranial posterior cerebral artery

With modern multislice scanners and optimized protocols," CTA images can provide excellent visualization of the primary intracranial arteries (i.e., the proximal anterior, middle, and posterior cerebral arteries), their smaller secondary... 

IMS I II <3 h (no lA infusion beyond 7 h) >10 No intracranial tumors, hemorrhage, significant mass effect with midline shift, or large (>l/3 of the MCA territory) regions of clear hypodensity on the baseline CT scan (sulcal effacement and/or loss of gray-white differentiation alone was allowed) Occlusion of the MCA, anterior cerebral artery. Posterior cerebral artery, or BA... 

Neurological involvement in Behcet s disease may be subclassified into two major forms a vascular-inflammatory process with focal or multifocal parenchymal involvement and a cerebral venous sinus thrombosis with intracranial hypertension. The vasculitis and meningitis may affect cerebral arteries, particularly in the posterior circulation, to cause ischemic stroke and possibly intracranial hemorrhage (Farah et al. 1998 Krespi et al 2001 Siva et al. 2004 Borhani Haghighi et al. 2005). 

Intracranial aneurysms are not congenital but develop over the course of life. Approximately 10% of aneurysms are familial, and candidate genes identified thus far include those coding for the extracellular matrix. Saccular aneurysms tend to occur at branching points on the circle of Willis and proximal cerebral arteries approximately 40% on the anterior communicating artery complex, 30% on the posterior communicating artery or distal internal carotid artery, 20% on the middle cerebral artery and 10% in the posterior... 

Most arterial aneurysms arise at the bifurcation of major arteries, and this is also true for the intracranial location. Around 85% of all intracranial aneurysms originate from the anterior circulation. The most common location (30%-35%) is the anterior communicating artery (Acorn). However, many of these so-called Acorn aneurysms do have their origin at the A1/A2 junction of the anterior cerebral artery and do not involve the anterior communicating artery. Internal carotid and posterior communicating artery aneurysms account for 30% and middle cerebral artery (MCA) bifurcation aneurysms for 20%. Around 15% of intracranial aneurysms arise at the vertebrobasilar circulation. Half of them develop at the basilar tip (with various degrees of involvement of the PI segments) and the other 50% from other posterior fossa vessels. Aneurysms of the anterior inferior cerebellar artery (AICA) and vertebral artery (VA) aneurysms without involvement of the VA-PICA junction or the vertebrobasilar site are extremely rare. 

The anatomic substrate of potential collateral pathways (particularly involving the circle of Willis) must also be assessed, which requires angiographic study of the intracranial circulation from selective carotid and vertebral injections. Prospective identification of major breaks within the circle of Willis that result in partial or complete isolation of the cerebral circulation [e.g. ipsilateral absent Al segment and posterior communicating artery (PCoA)], is often enough to dissuade one from performing a balloon test... 

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