Appearance of an anterior communicating artery aneurysm during vasospasm treatment after angiogram-negative subarachnoid hemorrhage: A case report

This case underscores that even with negative initial angiography, an underlying aneurysm should be strongly suspected in patients with diffuse SAH or subsequent vasospasm. It highlights the critical importance of meticulous follow-up and appropriately timed, high-quality imaging re-evaluation, which can lead to accurate diagnosis and favorable outcomes.