This is a retrospective real world registry study, aiming to explore the effectiveness and safety of endovascular treatment of acute ischemic stroke in a Chinese population.

Inclusion Criteria:

• Age: ≥ 18;
• Ischemic stroke confirmed by head CT or MRI;
• Patients receiving endovascular treatment;
• First ever stroke or mRS≤2 after previous disease;
• Complete and clear pre- and post-operative DSA images are available

Exclusion Criteria:

• Imaging data not qualified for evaluation;
• Absence of important clinical data;
• The first 50 patients receiving endovascular treatment in a single centerr.

all patients must receive endovascular treatment regardless of the time from onset to treatment.