Follow-up examinations after spring coil embolization of aneurysms: 1, MRA (CE); 2, MRI (3D-TOF); 3, head simple radiography; 4, DSA. Note: 1, CTA review is not recommended for aneurysms after spring coil embolization because the artifacts of the spring coil under CT are large enough to obscure the image of aneurysm recurrence. 2. Current clinical experience has shown that the spring coil and the adjuvant embolization stent can be scanned with 3.0T MRI, and their magnetic properties and heat production do not cause any harm to humans. Follow-up methods: 1. Classic MRA: Aneurysm lumen recurrence of 2mm degree can be detected. Note: The incidence of MRA without aneurysm recurrence and DSA finding recurrent aneurysm is 6-14%. 2. MRI with 3D-TOF image: It is also effective in detecting aneurysm recurrence, and some literature reports that its evaluation is better than MRA. Note: Coil is Low intensity in MRI images, and thrombus in thrombosed aneurysm is High intensity. 3. Simple head radiography: It can detect movement and deformation of Coil, usually The evaluation is performed using images in 3 directions: frontal, lateral and tonal. Note: The angles of the follow-up radiographs should be consistent, otherwise the deformation and displacement of the coil may be misjudged. Follow-up time: 1. MRI: 1 week, 6 months, 1 year after surgery, and annually thereafter; 2. Simple head radiography: 6 months, 1 year after surgery, and annually thereafter; 3. If abnormalities are found in the above 2 follow-up methods, DSA will be reviewed immediately; if there are no abnormalities in the above 2 follow-up examinations, DSA will be reviewed 1 year after surgery, and annual DSA review is not necessary thereafter.