الفهرس 
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Abstract
From the results of the studies concerning with posterior circulation aneurysms ,the following could be concluded.
1) The commonest site for aneurysms is the basilar bifurcation (51%).
2) The most common configuration encounterd is the saccular tybe.
3) The most common presentation of patients with posterior circulation aneurysms is (S.A.H).
4) Four-vessel cerebral angiography remains the most important diagnostic tool prior to any surgical intervention.
5) Early surgery and nimodipine treatment in the patients appears to accelerate clearance of blood from the sub-arachnoid spaces and reduce the incidence of delayed ischaemic neurological deficits(I.N.D)) occurring in 20% of good risk patients ”clinical gradeI-II”.In addition,early aneurysm repair would safely permit induced hypertention,hypervolaemia which could reverse incipient (I.N.D).
6) Different surgical approaches were employed and it was proved that the Sylvian fissure approache is the most suitable approach for basilar bifurcation,basilar-(S.C.A) and proximal posterior cerebral artery aneurysms.The retromastoid approach the most suitable approach for (P.I.C.A) aneurysms.
7) Hunt and Hess clinical grade on admission has the greatest impact on the final outcome.
Finally,with recent surgical techniques, early surgical interventions and the use of calcium antagonist nimodipine, the morbidity and mortality associated with posterior circulation aneurysm surgery can be greatly minimized and even abolished in good risk patients in clinical gradeI-II.