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Neurosurgery
Surgical Technique for Removal of Clinoidal Meningiomas
Built from Feldman — Neurosurgical Operative Atlas: Neuro-Oncology
What’s inside
10 sections · 55 slides
Overview
- What this deck teaches
The tumor and its neighborhood
Why location, not size, defines the difficulty
- First, what is a meningioma?
- The anterior clinoid process (ACP): the launch pad
- Naming: the same tumor, many labels
- When is a tumor truly 'clinoidal'?
- Tumor hiding the nerve and artery
The core idea: the Dolenc approach
Find and free the optic nerve before touching the tumor
- Where the technique came from
- Pterional craniotomy and clinoid drilling
- Why remove the clinoid at all?
- Two ways to find the nerve and artery
- Why the optic canal is the reliable landmark
- Decompressing the nerve: the falciform ligament
- The technique in three moves
- Five advantages of the skull base technique
Choosing the right patient
Indications, alternatives, and timing
- When to use the full skull base technique
- When a simpler operation suffices
- Timing: operate early in younger patients
- Alternatives to surgery
Preoperative management
Medication, eye testing, and the artery question
- Preoperative preparation
- Testing the carotid artery: balloon occlusion
- Why can't clinoidal meningiomas be embolized before surgery?
The operation begins
Principles, positioning, and opening the skull
- Nine principles of meningioma surgery
- The seven steps of the skull base technique
- Positioning the patient
- The incision
- The craniotomy
The skull base drilling
Unroofing the optic canal and removing the clinoid
- Drilling toward the optic canal
- Two safety rules while drilling
- Why no lumbar drain?
- Removing the anterior clinoid process
- Controlling the venous bleeding
- Extradural skull base technique, step by step
Opening the dura
Reaching the freed nerve and locating the artery
- The two-step dural opening
- Finding the carotid artery
Removing the tumor
Debulking, dissecting, and dividing a large tumor
- Working around a decompressed nerve
- Debulking and preserving vessels
- Structures to identify and protect
- Divide and conquer: the five-segment strategy
- When the tumor invades the cavernous sinus
Closing up and looking ahead
Closure, recovery, and protecting vision
- Closure
- Why vision is the real endpoint
- A few anchor numbers
- The modern promise of this technique
- Key takeaways
- Neurosurgical Operative Atlas: Neuro-Oncology