In 4 stenotic arteries, which were demonstrated runoff vessels by the operation but not indicated by the CE MRA before operation, only 1 segment was indicated bypass vessels by CE MRA;

• 4支被手术证实的远端流出道通畅的血管而CE MRA显示远端无流出道的病例中，CE MRA只显示1例闭塞血管周围有侧支循环；