Dome-Only Aneurysm Coiling in Severe Aneurysmal Subarachnoid Hemorrhage

To prospectively capture data of patients treated with the guideline-recommended, standard-of-care dome-protection approach. The data will be used to determine: * (Primary) Incidence of aneurysm re-rupture by 90 days, censored at the time of definitive aneurysm treatment or death, detected on a surveillance head CT or one obtained after a neurological decline. * (Secondary) Measure functional status of patients around 90 days (+/- 14 days) * (Secondary) Measure success of dome protection as determined by angiographic criteria and procedural complications DOME protection is a treatment approach for patients who suffered a severe brain bleed due to an aneurysm. Instead of performing immediate, extensive surgery, this study investigates a minimally invasive procedure called "dome protection", which involves placing tiny coils to patch the most fragile part of the aneurysm. This method aims to prevent re-bleeding and allow the patient to stabilize before undergoing full aneurysm repair. The findings could lead to improved health outcomes in patients with aneurysmal subarachnoid hemorrhage by reducing procedure-related risks.