Meilleure citation de Mastering the Anterior Clinoid: A Six-Surface Surgical Guide
The anterior clinoid process is the ultimate 'high-rent' district of neuroanatomy; it’s a tiny piece of bone surrounded by the optic nerve, the internal carotid artery, and the oculomotor nerve. To navigate it safely, you must stop seeing it as a single spike and start treating it as a complex hexahedron with six distinct surfaces.
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Neurosurgical anatomy anterior clinoid
Foire aux questions
The eggshell technique is considered the gold standard for safety when removing the anterior clinoid process. Instead of attempting to remove large fragments of bone near sensitive structures, the surgeon uses a diamond burr with heavy irrigation to thin the bone down until it is translucent and fragile, much like an eggshell. This allows the bone to be skeletonized from the inside out, using the outer layer as a protective barrier for the surrounding nerves and vessels until the final fragments are carefully removed.
The optic strut is a critical pillar of bone that anchors the anterior clinoid process (ACP) to the sphenoid body. In the six-surface framework, it represents the inferomedial boundary and is the final structural attachment that must be disconnected to fully release the clinoid. Because it is deep and highly variable—with studies showing it can be asymmetric in 15% of patients—identifying and thinning the strut is essential for a successful and complete clinoidectomy.
While a routine clinoidectomy offers better surgical exposure and early tumor devascularization, data suggests it carries a higher risk of complications. Specifically, studies have shown a threefold increase in the odds of new cranial nerve deficits (12.5% in routine versus 3% in selective) and a doubling of vascular complication rates. However, proponents argue that these risks can be mitigated by using a highly structured, stepwise protocol and that the routine approach may lead to better long-term tumor control and lower recurrence rates.
This protocol transforms a high-stress maneuver into a predictable, stepwise process. Stage 1 focuses on "Setup," which involves peeling the dura and removing the orbital roof to bring the ACP to the surface. Stage 2 focuses on "Decompression" through four specific steps: performing the extradural clinoidectomy, unroofing the optic canal, releasing arachnoid bands, and incising the falciform ligament. By following this checklist, surgeons ensure the optic nerve is fully decompressed early in the procedure, which is a primary predictor of positive visual outcomes.
The LOCR is the primary anatomical landmark used during an endoscopic endonasal anterior clinoidectomy. When approaching from the "bottom up" through the sphenoid sinus, the ACP is represented by this small, triangle-shaped depression. Surgeons navigate the region by identifying the three vertices of the LOCR triangle—superomedial, superolateral, and inferior—and drilling within these boundaries to disconnect the clinoid tip from its base.
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