Clinical Scorecard: Recent Insights on Anterior Clinoid Process Resection in the Surgical Management of Anterior Clinoid Meningiomas: A Comprehensive Literature Review and Innovative Educational Framework

At a Glance

Key Highlights

• Visual impairment occurs in up to 60% of ACM patients due to ischemia and compression of the optic apparatus.
• Anterior clinoidectomy (AC) facilitates early tumor devascularization, optic nerve decompression, and increased surgical working space.
• Anatomical variations like pneumatization and ossification of dural ligaments increase surgical risks such as CSF leak and internal carotid artery injury.

Guideline-Based Recommendations

Diagnosis

• Clinical presentation includes progressive visual loss and headache.
• Imaging to assess tumor relation to optic apparatus and vascular structures is essential.

Management

• Anterior clinoidectomy (preferably extradural approach) is integral for tumor devascularization and optic nerve decompression.
• Use of high-speed drills with cooling irrigation or ultrasonic bone curettes to safely remove the anterior clinoid process.
• Two-stage, four-step surgical approach involving cranio-orbital pretemporal approach and extradural anterior clinoidectomy with optic canal unroofing.

Monitoring & Follow-up

• Postoperative visual function monitoring due to risk of optic nerve injury.
• Intraoperative exposure of internal carotid artery for potential temporary clipping if needed.

Risks

• Potential injury to optic nerves from tumor manipulation and surgical handling.
• Risk of cerebrospinal fluid leak due to anatomical variations such as pneumatization of the ACP.
• Risk of internal carotid artery injury related to ossification of dural ligaments forming osseous bridges.

Patient & Prescribing Data

Patients undergoing surgical resection of anterior clinoid meningiomas

Surgical removal of the anterior clinoid process improves tumor devascularization and optic nerve decompression but visual improvement rates remain suboptimal (~48%). Anatomical variations must be considered to minimize complications.

Clinical Best Practices

• Preoperative planning should include detailed anatomical assessment of the anterior clinoid process and adjacent structures.
• Employ extradural anterior clinoidectomy with high-speed drilling and copious irrigation to reduce thermal injury risk.
• Follow a staged surgical approach: initial cranio-orbital exposure and dural peeling, followed by anterior clinoidectomy, optic canal unroofing, and arachnoid band release.
• Maintain readiness for temporary internal carotid artery clipping during surgery.
• Recognize and manage anatomical variations such as pneumatization and ossified dural ligaments to prevent CSF leak and vascular injury.

References

• Dolenc and Almefty pioneering work on anterior clinoidectomy
• Visual impairment and surgical outcomes in ACM - Reference 22
• Anatomical overview of anterior clinoid process - References 3, 13, 25, 28
• Extradural anterior clinoidectomy technique descriptions - References 3, 29, 30, 33, 39
• Anatomical variations and surgical risks - References 37, 39