Inter-dural approach to parasellar tumors

Area of Science:

• Neurosurgery
• Anatomy
• Surgical Oncology

Background:

• The parasellar region harbors diverse tumors.
• Tumor resection morbidity is linked to cranial nerve preservation.
• Understanding lateral parasellar anatomy is crucial for surgical outcomes.

Purpose of the Study:

• To elucidate the anatomical structures of the lateral parasellar region.
• To describe a novel inter-dural surgical approach for parasellar tumors.
• To evaluate the safety and efficacy of this approach.

Main Methods:

• Microsurgical dissection of six cadaveric heads.
• Histological examination of three cadaveric heads.
• Demonstration of the inter-dural approach using clinical case experience.

Main Results:

• The middle cranial fossa dura has distinct periosteal and meningeal layers, creating an inter-dural space in the parasellar region.
• This space contains cranial nerves, the cavernous sinus, and the carotid artery, with nerves protected by an inner membrane.
• A periosteal incision along the cavernous sinus inferior margin provides access without subdural compromise.

Conclusions:

• The inter-dural approach is anatomically feasible and clinically valuable for resecting parasellar tumors.
• This technique facilitates safe surgical removal of tumors such as trigeminal neurinoma and cavernous hemangioma.
• Preservation of neural and vascular structures is enhanced by this minimally invasive method.