Variations in the Anatomy of Sphenoid Sinus: A Computed Tomography Investigation
Mohammad Taghi Joghataei *
Department of Anatomy, Medical School, Iran University of Medical Science, Tehran, Iran.
Amir Hosseini
Department of Anatomy, Medical School, Iran University of Medical Science, Tehran, Iran.
Javad Mohajer Ansari
Department of Anatomy, Medical School, Iran University of Medical Science, Tehran, Iran.
Ehsan Golchini
Department of Anatomy, Medical School, Iran University of Medical Science, Tehran, Iran.
Zeinab Namjoo
Department of Anatomy, Medical School, Iran University of Medical Science, Tehran, Iran.
Keywan Mortezaee
Department of Anatomy, Kurdistan University of Medical Science, Sanandaj, Iran.
Ebrahim Pirasteh
School of Rehabilition, Zahedan University of Medical Science, Zahedan, Iran.
Amirhossein Dehghani
Medical School, Iran University of Medical Scienc, Tehran, Iran.
Saeid Nassiri
Departmant Radiology of Emamhossein Hospital, Shahid Beheshti Medical Science University, Tehran, Iran.
*Author to whom correspondence should be addressed.
Abstract
Aims: The sphenoid sinus is surrounded by many neurovascular structures which are very vulnerable to intrasphenoid sinus surgeries. The purpose of this study is to investigate the variation of sphenoid sinus structure by CT scan imaging.
Methodology: This is a retrospective study of 3D images of a paranasal sinus in 129 cases. In this study, three-way metering of the sphenoid sinus, additional septum, pneumatization of the period process (PP), anterior clinoid process (ACP) and greater wing of sphenoid and protrusion and dehiscence of adjacent structures will be assessed.
Results: Protrusion of internal carotid artery (ICA), a vidian nerve, maxillary nerve (V2) and optical canal were seen respectively 50.4%, 57.36%, 62.5% and 54.3% but dehiscence of this structure was seen 8.5%, 7%, 3.9% and 6.2%. penumtazition of PP, ACP and greater wing of sphenoid were seen 96.87%, 43.9% and 41.1%. Additional septum also is seen in 76% of the population.
Conclusion: This study demonstrates numerous variations in sphenoid sinus structure. Some of the variations cause many problems during intrasphenoidal surgery. Therefore, physicians should evaluate patients completely before surgery.
Keywords: Paranasal sinus, internal carotid artery, median nerve, maxillary nerve, optical canal.