title: The classification of frontal sinus pneumatization patterns by CT-based volumetry.
abstract: OBJECTIVE
  We aimed to define the classification of frontal sinus pneumatization patterns according to three-dimensional volume measurements.
  
  
  METHODS
  Datasets of 148 sides of 74 dry skulls were generated by the computerized tomography-based volumetry to measure frontal sinus volumes. The cutoff points for frontal sinus hypoplasia and hyperplasia were tested by ROC curve analysis and the validity of the diagnostic points was measured.
  
  
  RESULTS
  The overall frequencies were 4.1, 14.2, 37.2 and 44.5 % for frontal sinus aplasia, hypoplasia, medium size and hyperplasia, respectively. The aplasia was bilateral in all three skulls. Hypoplasia was seen 76 % at the right side and hyperplasia was seen 56 % at the left side. The cutoff points for diagnosing frontal sinus hypoplasia and hyperplasia were '1131.25 mm(3)' (95.2 % sensitivity and 100 % specificity) and '3328.50 mm(3)' (88 % sensitivity and 86 % specificity), respectively.
  
  
  CONCLUSIONS
  The findings provided in the present study, which define frontal sinus pneumatization patterns by CT-based volumetry, proved that two opposite sides of the frontal sinuses are asymmetric and three-dimensional classification should be developed by CT-based volumetry, because two-dimensional evaluations lack depth measurement.
authors.affiliation: Department of Otorhinolaryngology, Dokuz Eylul University School of Medicine, Izmir, Turkey. nesibe.gul.yuksel@gmail.com.|Silopi Devlet Hastanesi, Yenişehir Mah. 8. Cadde. No:73, Silopi, Şırnak, Turkey. nesibe.gul.yuksel@gmail.com.
authors.forename: Nesibe Gül
authors.initials: NG
authors.lastname: Yüksel Aslier
authors.affiliation: Department of Radiology, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Nuri
authors.initials: N
authors.lastname: Karabay
authors.affiliation: Department of Anatomy, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Gülşah
authors.initials: G
authors.lastname: Zeybek
authors.affiliation: Department of Biostatistics, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Pembe
authors.initials: P
authors.lastname: Keskinoğlu
authors.affiliation: Department of Anatomy, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Amaç
authors.initials: A
authors.lastname: Kiray
authors.affiliation: Department of Otorhinolaryngology, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Semih
authors.initials: S
authors.lastname: Sütay
authors.affiliation: Department of Otorhinolaryngology, Dokuz Eylul University School of Medicine, Izmir, Turkey.
authors.forename: Mustafa Cenk
authors.initials: MC
authors.lastname: Ecevit
mesh_terms: D063405:Anatomic Variation; D054893:Cone-Beam Computed Tomography; D005626:Frontal Sinus / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006801:Humans
keywords: Aplasia; Frontal sinus; Hyperplasia; Hypoplasia; Pneumatization; Volumetry