This project proposes to establish a prospective cohort of MIA based on a preexisting multicenter MIA database and to combine multidimensional methods such as high-resolution magnetic resonance, hemodynamics, ambulatory blood pressure, and imaging histology to study aneurysm instability.

Inclusion Criteria:

• Age 18-80 years old, male or infertile female;
• Diagnosed as IA (intracranial aneurysm) through CTA, MRA, or DSA; And it is suitable for endovascular intervention treatment
• The patient and/or their legal representative or guardian fully understand the research purpose, voluntarily participate and sign informed consent Books;
• Patients willing to cooperate with high-resolution magnetic resonance imaging.
• Patients willing to follow up and evaluate according to clinical research protocol requirements

Exclusion Criteria:

• AVM (arteriovenous malformation), Moyamoya disease, or DAVF (dural arteriovenous fistula) related aneurysms;
• Patients with contraindications for high-resolution magnetic resonance imaging;
• Participants in clinical trials of other drugs or medical devices;
• Patients with severe underlying diseases and extremely poor clinical conditions who cannot tolerate general anesthesia surgery;
• Patients with poor compliance and inability to cooperate with follow-up;
• Possible or clear history of severe allergy to contrast agents;
• Patients with a life expectancy of less than 2 years;
• Women who are breastfeeding and preparing for pregnancy during the study period

Inclusion Criteria:

1. be older than 18 years of age; 2. complete a high-resolution magnetic resonance exam

Exclusion Criteria:

1. aneurysm combined with other cerebrovascular diseases; 2. substandard image quality