Aneurysms posterior cerebral artery

Fig. 5.4a-c. Infectious aneurysm of the right posterior cerebral artery. T2-weighted image (a), FLAIR image (b) with subarachnoid blood around the aneurysm and DSA (c)... 

Fig.5.6a-d. Various locations of aneurysms. a Vertebrobasilar junction aneurysm. bTrue PICA aneurysm, c Basilar trunk aneurysm, d Basilar trunk aneurysm between origin of superior cerebellar artery and posterior cerebral artery, so-called superior cerebellar artery aneurysm... 

Fig. 5.16. a Giant ICA aneurysm inducing optic nerve compression in a 10-year-old boy with visual deficit on the right eye. b Brain stem aneurysm between origin of the superior cerebellar artery and posterior cerebral artery resulting in right sided oculomotor palsy. c,d Pcom aneurysm (c DSA, lateral view) in a 46-year-old-patient with oculomotor palsy note the close relationship of the aneurysm and the oculomotor nerve (arrow) but without visible contact (d, sagittal reconstruction of CISS sequence)... 

Fig. 5.20. Acutely ruptured fusiform posterior cerebral artery aneurysm before and after endovascular treatment. Overlay of 3D vessel anatomy on cross-sectional CT-like images showing extensive SAH...

Aneurysms of the posterior cerebral artery (PCA) are relatively rare compared with those in other locations. Extremely rare are singular berry aneurysms of the PCA. Often, this type of aneurysm is either associated with the incidence of multiple aneurysms or with other vascular disorders like ar-terious-venous-malformations, moyamoya disease or ipsilateral internal carotid occlusion for various reasons. Other rare causes are infectious and post-traumatic conditions. Some authors figured out that the incidence of PCA aneurysms is approximately... 

Ciceri EE, Klucznik RP, Grossman RG, Rose JE, Mawad ME (2001) Aneurysms of the posterior cerebral artery classification and endovascular treatment. AJNR Am J Neuroradiol 22 27-34... 

Fig. 40.2 Fusiform acutely ruptured posterior cerebral artery aneurysm before and after parent artery coil occlusion (DSA). Postprocessing of FD-dataset with overlay of 3D-DSA vessel anatomy (displayed in red color) and soft tissue imaging of FD-CT...

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... 

Fig. 25.2. Oblique transversal reformatted volume-rendered multi-detector row CT angiogram with a superior cut of a patient suffering from a subarachnoidal hemorrhage. Image shows a giant aneurysm of the right median cerebral artery (black asterisk) with a small daughter aneurysm (long arrow). There are two other small aneurysms, one in the posterior branch of the median cerebral artery (short arrow) and the other in the anterior communicating cerebral artery (arrowhead)...

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. 

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