- For patients with a cerebral disease, detection on the MRI or the CTscan of a real arteriovenous malformation, or an untreated intracranial aneurysm, or a cavernous angioma, or an amyloid angiopathy, or any new or significant (≥ grade 2) intratumoral bleeding other than microbleeds on T2* weighted MRI in the previous 14 days before treatment initiation, or a recent and untreated subdural effusion.