Fig. 3From: The classification of intracranial aneurysm neck: a single center research experienceAneurysm neck type: 3.1 of type A (neck curved single surface, and the surface is less than the parent artery circumference 1/2, 3.2 of type B (neck curved single surface, but greater than the parent artery circumference 1/2), 3.3 A (type II aneurysm neck is double curved surface, and less than the parent artery), 3.4 week long 1/2 II type B (a double neck curved surface, but greater than the parent artery circumference 1/2), 3.5 A (type III neck surface is curved, and less than the parent artery circumference 1/2), 3.6 B (type III aneurysm neck surface a surface, which is larger than the parent artery circumference 1/2)Back to article page