Clinical Scorecard: Neurological Recovery After Endovascular Occlusion of a Ruptured A2 Segment Aneurysm of the Anterior Inferior Cerebellar Artery: A Case Study

At a Glance

Key Highlights

• AICA a2 segment aneurysms are rare, often nonsaccular, and located near the meatal loop complicating surgical and endovascular reconstruction.
• Endovascular parent artery occlusion (ePAO) is a feasible treatment option despite inevitable IAA occlusion and associated neurological deficits.
• Neurological recovery including improvement of facial palsy and audiovestibular function can occur post-ePAO despite initial deficits from IAA occlusion.

Guideline-Based Recommendations

Diagnosis

• Use computed tomography (CT) to identify subarachnoid hemorrhage and angiography (TFCA) to locate and characterize AICA aneurysms.
• Perform formal otologic examinations including audiometry and electroneurography (ENoG) to assess facial nerve and hearing function post-procedure.

Management

• Consider endovascular parent artery occlusion (ePAO) for ruptured AICA a2 segment aneurysms when direct clipping or coiling is not feasible.
• Administer guideline-based subarachnoid hemorrhage management including enteral nimodipine.
• Use oral corticosteroids (e.g., methylprednisolone) for facial nerve palsy when indicated; surgical decompression reserved for severe degeneration (>90%).

Monitoring & Follow-up

• Monitor neurological status including Glasgow Coma Scale and House-Brackmann facial nerve grading.
• Perform follow-up imaging such as diffusion-weighted MRI to exclude brainstem or cerebellar infarction.
• Conduct serial audiometric evaluations to track hearing recovery.

Risks

• Inevitable occlusion of the internal auditory artery (IAA) during ePAO can cause facial palsy, loss of tongue sensation, and audiovestibular deficits.
• Potential for inner ear infarction due to compromised blood supply from IAA occlusion.
• Risk of neurological deficits due to ischemia in AICA territory despite collateral circulation.

Patient & Prescribing Data

64-year-old male with ruptured AICA a2 segment aneurysm and subarachnoid hemorrhage

Endovascular parent artery occlusion with coil embolization led to initial facial palsy and hearing loss, followed by gradual neurological recovery with corticosteroid therapy and supportive care.

Clinical Best Practices

• Evaluate collateral circulation (SCA and PICA) before ePAO to ensure adequate perfusion of AICA territory.
• Use detailed neuroimaging to localize aneurysm and assess involvement of the internal auditory meatus and IAA origin.
• Implement early and comprehensive neurological and otologic assessments post-procedure.
• Administer corticosteroids for moderate facial nerve palsy and avoid surgical decompression unless severe degeneration is present.
• Provide long-term follow-up including clinical and imaging assessments to monitor recovery and detect residual lesions.

References

• Article source