Basilar perforator Charcot-Bouchard aneurysms (CBA) are a rare etiology of intracerebral hemorrhage (ICH); they are more typically located on lenticulostriate perforators off the middle cerebral artery (MCA) and rupture usually leads to subarachnoid hemorrhage. The prevalence of basilar perforator CBA is less than 1% with less than 100 cases reported in the literature. There are no reported cases of basilar CBA causing ICH—all ruptured cases in the literature have been seen with SAH that are managed in different ways, often conservatively, with ~20–30% risk of re-rupture in those cases.
Hayek et al. (Tue,) studied this question.