Abstracts

Rationale: To define the landmarks for a corticoamygdalohippocampectomy by a microanatomical study performed preserving the arachnoidal layers.Methods: The study was performed in 8 hemispheres which were kept with their arachnoidal layers and treated previously with the Klinger method (freezing and fixed in formalin). They were dissected as performing a corticoamigdalohipocampectomy. The dissection take great care in keeping the arachnoid of the silvian fissure as to preserve the anatomy of the vascular structures in it. After temporal lobectomy and resection of the mesial structures the landmarks were verified. Results: We found very useful to understand the importance of the subpial dissection and the technique in detail, recognizing at the end every landmark and anatomical characteristics of each specimen. The most important landmarks for performing a temporal lobectomy are the inferior choroidal point, the reflection of the arachnoid just at the limen insula, and obviously the arachnoidal plainConclusions: The dissection in the lab allowed us to recognize the structures related to a temporal lobectomy, and define the landmarks for the excision of the amygdala , wich in our point of view are useful, these are the inferior choroidal point as well as the reflection of the arachnoidal layer at the limen insula that is easy to identify during the technique of performing a standard temporolobectomy. Furthermore this technique preserving the arachnoidal layers may be useful to practice the different approaches and pathologies in the brain in a perspective of a learning method for future neurosurgeons.