Clinical Research Directory

Inclusion Criteria: 1. Intracranial dissecting aneurysm clearly diagnosed by DSA and high-resolution MRI imaging (according to the imaging diagnostic criteria proposed in the Chinese Expert Consensus on Imaging Diagnosis of Intracranial Arterial Dissection) 2. patients managed with conservative treatment and follow-up 3. patients who agree and sign a written informed consent form Exclusion Criteria: 1. Arteritis, fibromuscular dysplasia, iatrogenic or traumatic pseudoaneurysms 2. Contraindications to MRI examination (such as claustrophobia or metallic implants), or contraindications to cerebral angiography (such as iodine contrast allergy) 3. Dissecting aneurysms extending from the extracranial segment to the intracranial segment, or cases with concomitant intracranial atherosclerotic plaques in the affected vessels 4. Patients who refuse MRI examination 5. Patients with severe comorbid diseases and an expected survival time of less than 2 years due to these conditions 6. Patients without follow-up HR-MRI imaging for any reason