Summary: The time-frame and the follow-up elements after embolization of brain aneurysm are not standardized. Therefore, few reliable follow-up data are available for these patients. This study aims at collecting standardized long term data for these patients, in order to assess the occurence of aneurysm recanalization and particularly those requiring another intervention on the aneurysm.

Summary: The natural course for meningioma suggests that a majority will grow over time. Treatment is usually indicated in growing or symptomatic meningiomas. Surgery is usually primary treatment, but there is a significant risk of adverse effects. Stereotactic radiotherapy is most often reserved to treat relapses after surgery, and except for surgery and radiotherapy there are no other established treatme...