Surgical Technique for Aneurysms at the A3 Segment of Anterior Cerebral Artery Via Anterior Interhemispheric Keyhole Approach
AIM: Traditional craniotomies for treatment of the aneurysms at the A3 segment of anterior cerebral artery (A3As), such as frontal
approach and interhemispheric approach, require pre-hairline incision and relatively long incision, extensive bone flap, inevitable
supraorbital nerve injury, opening frontal sinus, and increased operative time. Here we reported anterior interhemispheric keyhole
approach with minimally invasive advantages for treatment of A3As.
MATERIAL and METHODS: Thirteen A3As and one A1 aneurysm in thirteen patients were confirmed by computed tomographic
angiography (CTA) and/or digital subtraction angiography (DSA). All patients underwent anterior interhemispheric keyhole approach
with a hairline incision across the midline and a bone flap 3-4 cm in diameter, combined with external ventricular drainage,
neuronavigation, intraoperative neurophysiological monitoring (IONM), and transcranial Doppler (TCD). Clinical characteristics and
therapeutic results of the patients were analyzed, and the postoperative functional capacities of those patients were evaluated using
Glasgow Outcome Scale (GOS) six months later.
RESULTS: All aneurysms were successfully obliterated via the anterior interhemispheric keyhole approach combined with external
ventricular drainage. Mean duration of surgery (from skin incision to wound closure) was 100 minutes with a range of 70 to 135
minutes. No severe interhemispheric keyhole approach related complications, postoperative infections, secondary intracranial
haemorrhage, severe cerebral vasospasm, and aneurysmal neck remnants were detected. Median hospital stay after surgery was
9.0 days (range 8 to 11 days). And the postoperative functional capacities evaluated by GOS were normal six months later.
CONCLUSION: The anterior interhemispheric keyhole approach combined with external ventricular drainage is a safe, effective,
and minimally invasive craniotomy technique for the treatment of A3 aneurysms.