The Clinical and Angiographic Features of Intracranial Aneurysms

717 cases confirmed by cerebral angiography in patients with intracranial aneurysms summary analysis of its clinical and angiographic characteristics , to explore the similarities and differences between ruptured and unruptured aneurysms , unruptured aneurysm rupture risk and principles . This group reflects the advantage of women , age of onset , the proportion of multiple aneurysms , the time pattern of SAH , cerebral vasospasm situation , parts distribution , ruptured aneurysm characteristics , A1 blood flow symmetry and other characteristics , summed up a greater number of redundant expansion and the characteristics of the dissection ; aneurysm in this group is less than the foreign reports , rupture of the critical size is estimated to be 3 mm ; distinguish between ruptured and unruptured aneurysms independent of location, shape , whether ascus body neck ratio and patient age , draw aneurysm rupture probability equation ; this equation can help to develop the principles of unruptured aneurysms .