Spontaneous Resolution of a Post-Traumatic Distal Anterior Cerebral Artery Aneurysm

Traumatic intracranial aneurysms are rare consequences of blunt or penetrating head injury, carrying significant morbidity and mortality. We report a 33-year-old male who sustained severe head trauma with base of skull fracture and subarachnoid hemorrhage following a motor vehicle accident. He underwent craniotomy with evacuation of an intracerebral hematoma and fixation of depressed fracture segments. During the third week, he deteriorated due to a re-bleed at the operated site. Cerebral digital subtraction angiography revealed a pseudoaneurysm from the proximal A2 segment of the left anterior cerebral artery, prompting re-exploration. This case highlights the importance of considering post-traumatic aneurysm in patients with delayed neurological decline after head injury associated with skull bone fracture and subarachnoid hemorrhage.