Hoffman W F, Wilson C B
J Neurosurg. 1979 Feb;50(2):262-4. doi: 10.3171/jns.1979.50.2.0262.
A patient who presented with a subarachnoid hemorrhage was found to have a saccular aneurysm arising from the proximal basilar artery. The aneurysm was bilobed, directed anteriorly and inferiorly, and associated with a proximal fenestrated segment of the basilar artery.