Cognition and Imaging With Tigertriever

Inclusion Criteria: 1. Patients admitted with large vessel occlusion (LVO) and treated with the Tigertriever, as indicated per the approved IFU. 2. Tigertriever was used as the first line treatment in the target vessel. 3. A signed informed consent. 4. Age 18-75 years (inclusive). 5. No known significant pre-stroke disability (pre-stroke mRS 0 or 1). Exclusion Criteria: 1. Use of any other IA recanalization device prior to the Tigertriever in the target vessel, including aspiration catheter. 2. Evidence of acute brain hemorrhage on CT and/or MRI at admission. 3. Prior hemorrhage, stroke, thrombolysis, and/or endovascular therapy in the last 3 months. 4. Probable cerebral amyloid angiopathy. 5. Pre-stroke diagnosed dementia and/or prescribed cholinesterase inhibitors. 6. Pre-stroke diagnosed and/or currently treated major depression. 7. Pre-stroke learning or intellectual disability. 8. Anticipated inability to obtain 6-month follow-up assessments. \-