Natural Course of Ruptured but Untreated Intracranial Aneurysms: A Multicenter 2-Year Follow-Up Study.

Patients with poor Hunt and Hess grades, loss of consciousness at symptom onset, or largest aneurysms ≥5 mm in size showed a high mortality rate. A high number of treatment refusals was present in this study. These findings have implications for medical insurance policy, doctor-patient communication, and popular science education.