镜像动脉瘤发生、影像学及治疗精选.ppt

　 MirANs diagnosis approaches MRA CTA DSA MirANs were Classified as 2 type : Ⅰ type: complete symmetry Ⅱ type: incomplete symmetry * * Genesis, Imaging and Treatment of Intracranial Mirror Aneurysms (MirANs) Institute of Diagnostic and Interventional Radiology, The Sixth Affiliated People’s Hospital,Shanghai Jiao Tong University TAN HUA-QIAO MD. Ph.D. Definition of MirAN Uncommon，special subgroup of mutiple intracranial aneurysms; occuring at roughly the same location on each side in the same patient without considering the size of the aneurysms. ↙ ↘ → ← Hypothesis on genesis and growth of MirANs A different etiologic process occurs in mirror aneurysm disease. A congenital predisposition, and the early embryological derangement of vascular wall formation might be one of their underlying causes. Early rupture in patients with no extrinsic risk factors support the role of a congenital predisposition over degenerative causes in the patients with MirAN. Hemodynamic forces might be responsible for triggering the development of an aneurysm in the primarily abnormal vessel wall. Epidemiology of MirANs Prevalence: Constitute less than 5% of overall aneurysms Account for approximately 20%–30% among multiple aneurysms Familial and twin intracranial aneurysm : 65～70% Non- familial, sporadic intracranial aneurysm: ～21% Our result from 190 patients harboring mutiple intracranial aneurysms between June 2007 and July 2011 MANs account for 26.3% among multiple aneurysms Epidemiology of MirAN Location Common location: MCA bifurcation and PCoA reported by literature Uncommon site: ACA A1, Pericallosal,Vertebral Artery Our result from 50 patients with MirAN between June 2007 and July 2011 MCA bifurcation (10%) PCoA/C7 (24%) C6 (24%) C5 (20%) C4 (20%) Other location ( 2%) Epidemiology of MirANs Gend