title: Surgical Measurement of the Sphenoid Sinus on Sagittal Reformatted CT in the Turkish Population.
abstract: OBJECTIVE
  The objectives of this study were to determine sinus measurements specific for the Turkish population using CT sagittal thin-slice reconstruction images and to clarify the three-dimensional anatomical features of the sphenoid sinus, along with its surrounding structures, that are relevant to performing an endoscopic sphenoidotomy.
  
  
  METHODS
  Images of 300 patients (165 female, 135 male) were studied. The research was conducted on the axial plane with a 1 mm slice thickness and a 0.6 mm slice interval, and sagittal reconstruction was performed with a 0.4 mm slice interval. Measurements of the sinus were obtained, and the presence of Onodi cells was researched.
  
  
  RESULTS
  Line 1 was found to be significantly shorter in the Turkish patients of this study compared to studies of other populations. Lines 4 and 6 were found to be longer on the left side (Line 4 right: 18.8±3.6 mm, left: 19.3±3.4 mm, p=0.027; Line 6 right: 24.1±6.8 mm, left: 24.3±6.8 mm, p=0.008). Lines 2, 3, 4 and 6 were longer in men than in women (p<0.05).
  
  
  CONCLUSIONS
  In the Turkish population, Line 1 is shorter, so the risk of skull base perforation is greater. Lines 4 and 6 are longer on the left side; thus, choosing the left ostium in sinus dilation is safer. Because of sex differences regarding Lines 2, 3, 4 and 6, sex should be considered in sphenoid sinus procedures.
authors.affiliation: Department of Radiology, Diskapi Yildirim Beyazit Training and Research Hospital, Ankara, Turkey.
authors.forename: Hatice
authors.initials: H
authors.lastname: Kaplanoglu
authors.affiliation: Department of Radiology, Ankara Numune Training and Research Hospital, Ankara, Turkey.
authors.forename: Veysel
authors.initials: V
authors.lastname: Kaplanoglu
authors.affiliation: Department of Radiology, Ankara Numune Training and Research Hospital, Ankara, Turkey.
authors.forename: Ugur
authors.initials: U
authors.lastname: Toprak
authors.affiliation: Department of Radiology, Diskapi Yildirim Beyazit Training and Research Hospital, Ankara, Turkey.
authors.forename: Baki
authors.initials: B
authors.lastname: Hekimoglu
keywords: CT measurements; Sagittal reformatted images; Sphenoid sinus