Thrombectomy Versus Best Medical Management in Large Vessel Occlusion Stroke Patients Presenting Beyond 24 Hours and With Presence of Collateral Flow on CT Angiography

"Endovascular thrombectomy (EVT) in this clinical trial involves the mechanical removal of a thrombus from a blocked large cerebral artery using specialized devices like stent retrievers or aspiration catheters. Key distinguishing features of this EVT protocol include:~* Extended Time Window: Unlike standard EVT, which is typically performed within 24 hours after symptom onset, this intervention targets patients presenting beyond 24 hours.~* Collateral Circulation Assessment: Multi-phase CT angiography (CTA) is employed to evaluate collateral flow, prioritizing patients with favorable collateral grades. This selection process helps ensure the identification of patients most likely to benefit from EVT despite the late presentation."