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SA Souza, MMA Souza, RLM Rivero, RQ Guimaraes, LR Wanderley, FT Pacheco, RA Mendonca

Reference Points for the Assessment of the Course of the Anterior and Posterior Ethmoid Arteries by Multislice CT. SA Souza, MMA Souza, RLM Rivero, RQ Guimaraes, LR Wanderley, FT Pacheco, RA Mendonca. Disclosures: None. PURPOSE.

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SA Souza, MMA Souza, RLM Rivero, RQ Guimaraes, LR Wanderley, FT Pacheco, RA Mendonca

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  1. Reference Points for the Assessment of the Course of the Anterior and Posterior Ethmoid Arteries by Multislice CT SA Souza, MMA Souza, RLM Rivero, RQ Guimaraes, LR Wanderley, FT Pacheco, RA Mendonca

  2. Disclosures: None

  3. PURPOSE To identify the landmarks of the anterior ethmoidal artery (AEA) on the orbital medial wall and on the lateral wall of the olfactory fossa. To describe the approach to the radiologic landmarks of the posterior ethmoidal artery (PEA).

  4. APPROACH / METHODS • Anterior ethmoidal artery (AEA) course/pathway • orbit • anterior ethmoidal foramen • ethmoid labyrinth • anterior ethmoidal canal • anterior ethmoidal sulcus • olfatory fossa

  5. Anterior ethmoidal artery arising from ophtalmic artery Henry Grey (2018)

  6. Anterior ethmoidal artery arising from ophtalmic artery https://www.uvm.edu/medicine/surgery/documents/Skullbasetumorsandsurgery2.pdf

  7. AEA Anterior ethmoidal foramen

  8. Anterior ethmoidal canal

  9. Anterior ethmoidal sulcus

  10. AEA positioning in sagittal plane

  11. APPROACH / METHODS Shortly after the ophthalmic artery enters the orbit, thePEA emerges in its posterior third, usually above the superior oblique muscle. On its intra-orbital course, we observe it follows a superior convex loop and ends up above the oblique muscle.

  12. APPROACH / METHODS After its intra-orbital path, the PEA continues towardsthe frontoethmoidal suture and enters through the posteriorethmoidal canal to cross the ethmoidal labyrinth a fewmillimetres from the anterior wall of the sphenoid sinus, inthe sphenoethmoidal angle.

  13. APPROACH / METHODS Its path in the ethmoidal canalis slightly shorter and has a more horizontal orientation thanthat of the AEA

  14. Posterior ethmoidal artery arising from ophtalmic artery Henry Grey (2018)

  15. Posterior ethmoidal artery arising from ophtalmic artery https://www.uvm.edu/medicine/surgery/documents/Skullbasetumorsandsurgery2.pdf

  16. AEA PEA Anteriorand posterior ethmoidal canal

  17. frontoethmoidal suture and posterior etmoidal canal

  18. PEA positioning in sagittal plane

  19. SUMMARY / CONCLUSION The medial notch of the orbit (anterior ethmoidal foramen) and the anterior ethmoidal sulcus on the lateral wall of the olfactory fossa were reliable parameters for identifying the course of the anterior ethmoidal artery.

  20. Anterior ethmoidal foramen Anteriorethmoidal sulcus

  21. SUMMARY / CONCLUSION • There are no well-documented anatomical references to identify the PEA in CT studies: • - frontoethmoidal suture and a posterior etmoidal canal can be the landmarks to help surgical planning.

  22. Frontoethmoidalsuture Posterior etmoidal canal

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