Evaluation of neurovascular structures according to sphenoid sinus variations using contrasted hypophyseal MRİ

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Bahçeşehir Üniversitesi, Lisansüstü Eğitim Enstitüsü, Sinirbilim, Türkiye

Tezin Onay Tarihi: 2020

Tezin Dili: İngilizce

Öğrenci: FATMA ABDULRAHMAN ABDULRAHMAN ALFAGIEH

Danışman: Melike Yavuz

Özet:

Sphenoid sinus is the most inapproachable paranasal sinuses, lie within the body of sphenoid bone and enclosed by vital neural and vascular structures. Anatomically sphenoid sinus varying in size and shape. The prevalence of these variation changes according to age and sex. Detail understanding of anatomical variation is important for optimal patient care. This is a retrospective study investigate the prevalence of sphenoid sinus variation using MRI scan of pituitary gland for patient aged from 14-70 years at Bahcesehir University Hospital (Medical Park) in Goztepe/Istanbul, from first of June 2015 to thirty-first of July 2019. A total of 204 hypophyseal MRI scan was analyzed for sphenoid sinus volume, number of septae and its insertion site, type of pneumatization, optic nerve and internal carotid artery protrusion, and inter optic and inter carotid distance. The mean volume of the sphenoid sinus was 23.4cc. Single septa was prominent among study population (61.8percent) and the principle attachment site of the septa was sella (40.2percent). The commonest types of pneumatization was the post sellar type 58.3percent. The majority of optic nerves were protruding 43.6percent. The ICA in relation to the sphenoid sinus was seen protruded in most of cases (frequency 53.9percent). The mean inter-optic nerve distance just after coming from optic foramen was 11.84mm, prechiasmatic inter-optic nerve distance was 7mm. The distance between two cavernous carotid arteries was 20.53mm, inter-distance between paraclinoid carotid arteries was 13.72mm. the distance between optic nerves and the distance between carotid arteries was more in larger sphenoid sinus. This study shows that, the sinus volume effect the protrusion of optic nerve and the distance between two optic nerves and carotid arteries. The result of this study can assist the neurosurgeon and otorhinolaryngologist to decrease possible complications in trans-sphenoidal surgery by routine description of the sphenoid sinus and related neurovascular structures variations in the imaging report