ABSTRACT Objective: This study aimed to describe anatomic variants of sphenoidal sinuses and adjacent structures. Methods: A retrospective and descriptive study was carried out at The National and University Teaching Hospital Hubert Koutoukou Maga (CNHU-HKM), of Cotonou in Benin from November 1st to December 31st. A review of CT scans skull was done for the subjects aged at least 16 years old. Anatomic variants of the sphenoid sinuses and adjacent structures have been investigated. Results: 225 CT scans of skull were analyzed. The sellar type was the most common type of pneumatization of sphenoid sinuses (74.7%). Pneumatization of anterior clinoid processes of greater and lesser wings of the sphenoid and of pterygoid processes was observed in 7.1%; 4.6%; 3.3% and 7.3%; respectively. Protrusion of carotid canals and optic canals, maxillary and vidian nerves were observed in 48.3%; 13.1%; 18% and 9.5%; respectively. Conclusion: Risky anatomic variants of the sphenoid sinuses and adjacent structures are also described by CT-scan among Beninese. Before any surgery and to avoid bad outcome, a precise approach of these risky anatomic variants must be carried out by using CT-scan.
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Yèkpè, P. , Akanni, D. , de Souza, C. , Adjadohoun, S. , Kiki, M. , de Tovè, K. , Biaou, O. , Boco, V. and Boco, V. (2018) Anatomic Variants of Sphenoid Sinuses and Adjacent Structures: A Study of 225 Skull CT Scans at CNHU-HKM in Benin, West Africa. Open Journal of Radiology, 8, 181-190. doi: 10.4236/ojrad.2018.83021.
 Cappabianca, P., Cavallo, L.M., Colao, A., Del Basso De Caro, M., Esposito, F., Cirillo, S., et al. (2002) Endoscopic Endonasal Transsphenoidal Approach: Outcome Analysis of 100 Consecutive Procedures. Min-Minim Invasive Neurosurg, 45, 193-200. https://doi.org/10.1055/s-2002-36197
 Casselman, J.W. (2003) The Sphenoid Bone: Anatomy. Journal of Neuroradiology, 30, 201-210.
 Hamid, O., El Fiky, L., Hassan, O., Kotb, A. and El Fiky, S. (2008) Anatomic Variations of the Sphenoid Sinus and Their Impact on Trans-sphenoid Pituitary Surgery. Skull Base, 18, 9-15.
 Sareen, D., Agarwal, A.K., Kaul, J.M. and Sethi, A. (2005) Study of Sphenoid Sinus Anatomy in Relation to Endoscopic Surgery. International Journal of Morphology, 23, 261-266. https://doi.org/10.4067/S0717-95022005000300012
 Unal, B., Bademci, G., Bilgili, Y.K., Batay, F. and Avci, E. (2006) Risky Anatomic Variations of Sphenoid Sinus for Surgery. Surgical and Radiologic Anatomy, 28, 195-201. https://doi.org/10.1007/s00276-005-0073-9
 Wang, J., Bidari, S., Inoue, K., Yang, H. and Rhoton, A. (2010) Extensions of the Sphenoid Sinus. Neurosurgery, 66, 797-816. https://doi.org/10.1227/01.NEU.0000367619.24800.B1
 Kantarci, M., Karasen, R.M., Alper, F., Onbas, O., Okur, A. and Karaman, A. (2004) Remarkable Anatomic Variations in Paranasal Sinus Region and Their Clinical Importance. European Journal of Radiology, 50, 296-302. https://doi.org/10.1016/j.ejrad.2003.08.012
 Lu, Y., Pan, J., Qi, S., Shi, J., Zhang, X. and Wu, K. (2011) Pneumatization of the Sphenoid Sinus in Chinese: The Differences from Caucasian and Its Application in the Extended Transsphenoidal Approach. Journal of Anatomy, 219, 132-142. https://doi.org/10.1111/j.1469-7580.2011.01380.x
 ELKammash, T.H., Enaba, M.M. and Awadalla, A.M. (2014) Variability in Sphenoid Sinus Pneumatization and Its Impact upon Reduction of Complications Following Sellar Region Surgeries. The Egyptian Journal of Radiology and Nuclear Medicine, 45, 705-714. https://doi.org/10.1016/j.ejrnm.2014.04.020
 Dubrulle, F., Martin-Duverneuil, N. and Moulin, G. (2010) Imagerie en ORL. Elsevier Masson, Issy-les-Moulineaux, France, 448 p.
 Şirikci, A., Bayazit, Y.A., Bayram, M., Mumbuç, S., Güngör, K. and Kanlikama, M. (2000) Variations of Sphenoid and Related Structures. European Radiology, 10, 844-848. https://doi.org/10.1007/s003300051016
 Hewaidi, G. and Omami, G. (2008) Anatomic Variation of Sphenoid Sinus and Related Structures in Libyan Population: CT Scan Study. Libyan Journal of Medicine, 3, 128-133. https://doi.org/10.3402/ljm.v3i3.4775
 Dessi, P., Moulin, G., Castro, F., Chagnaud, C. and Cannoni, M. (1994) Protrusion of the Optic Nerve into the Ethmoid and Sphenoid Sinus: Prospective Study of 150 CT Studies. Neuroradiology, 36, 515-516. https://doi.org/10.1007/BF00593511
 Fasunla, A., Ameye, S., Adebola, O., Ogbole, G., Adeleye, A. and Adekanmi, A. (2012) Anatomical Variations of Sphenoid Sinus and Nearby Neurovascular Structures Seen on Computed Tomography of Black Africans. East and Central African Journal of Surgery, 17, 57.
 Gray, H. (1989) Gray’s Anatomy. Churchill Livingstone, Edinburgh, 376-377.
 Ouardi, F., Idrissi, A., El Bennal, N., Aineb, I. and Abdelouafi, A. (2009) ORL-WS-25 Sinus Sphenoidal: Variantes Anatomiques et Leurs Risques. Journal de Radiologie, 90, 1563.
 Maniglia, A.J. (1989) Fatal and Major Complications Secondary to Nasal and Sinus Surgery. The Laryngoscope, 99, 276-283. https://doi.org/10.1288/00005537-198903000-00008
 Sofferman, R.A. and Harris, P. (1995) Mosher Award Thesis. The Recovery Potential of the Optic Nerve. The Laryngoscope, 105, 1-38.
 Lane, A.P. and Bolger, W.E. (2002) Endoscopic Transmaxillary Biopsy of Pterygopal-Atine Space Masses: A Preliminary Report. American Journal of Rhinology & Allergy, 16, 109-112. https://doi.org/10.1177/194589240201600207
 Vidić, B. (1968) The Postnatal Development of the Sphenoidal Sinus and Its Spread into the Dorsum Sellae and Posterior Clinoid Processes. American Journal of Roentgenology, 104, 177-183. https://doi.org/10.2214/ajr.104.1.177