The TICI score is a grading system used to assess the patency of cerebral arteries after endovascular therapy for acute ischemic stroke. It ranges from 0 (no flow) to 3 (complete flow), providing a standardized method for classifying the degree of reperfusion achieved during the procedure. The TICI score helps clinicians evaluate the effectiveness of the intervention, guide further treatment decisions, and predict patient outcomes. It is an essential tool in assessing stroke severity and prognosis, facilitating appropriate patient management and optimizing therapeutic strategies.