A 29-year-old woman arrived at the ER complaining of the worst headache of her life, accompanied by nausea. Upon arrival, she had elevated blood pressure. An immediate CT scan revealed a subarachnoid hemorrhage. Subsequently, she was admitted to the ICU, and an urgent CT angiography identified an aneurysm in the left supraglenoid internal carotid artery (ICA).

The patient was informed that the aneurysm needed to be secured promptly to avoid the high risk of rebleeding, particularly within the first 24 hours, which could be fatal.