The hyperacute phase of cerebral infarction is defined as the time from the onset of the disease to the time of presentation to the doctor within 4.5 hours, which is also the time window for thrombolysis, and if the patient has no contraindications, he or she can undergo intravenous thrombolysis with alteplase. Within this time window, patients with cranial CT and magnetic resonance imaging generally can not detect cerebral infarction foci, and sometimes some indirect signs can be seen, such as mild edema, resulting in narrowing of the sulcus, widening of the cerebral gyrus, or localized tissue boundaries are more fuzzy and difficult to see clearly. In the case of a large cerebral infarction, it is possible to see a dense middle cerebral artery sign on CT. In this case, after excluding hemorrhage, the patient can be treated as a cerebral infarction and given emergency intravenous thrombolysis. The recanalization rate of the patient is around 30%, but it is important to note that thrombolysis carries a high risk of causing post-infarction hemorrhage or severe hemorrhage elsewhere. If thrombolysis is unsuccessful, patients with the condition can also bridge the artery to retrieve the thrombus.