title: Optic Strut and Para-clinoid Region - Assessment by Multi-detector Computed Tomography with Multiplanar and 3 Dimensional Reconstructions.
abstract: OBJECTIVE
  To evaluate thickness, location and orientation of optic strut and anterior clinoid process and variations in paraclinoid region, solely based on multidetector computed tomography (MDCT) images with multiplanar (MPR) and 3 dimensional (3D) reconstructions, among Indian population.
  
  
  METHODS
  Ninety five CT scans of head and paranasal sinuses patients were retrospectively evaluated with MPR and 3D reconstructions to assess optic strut thickness, angle and location, variations like pneumatisation, carotico-clinoid foramen and inter-clinoid osseous ridge.
  
  
  RESULTS
  Mean optic strut thickness was 3.64mm (±0.64), optic strut angle was 42.67 (±6.16) degrees. Mean width and length of anterior clinoid process were 10.65mm (±0.79) and 11.20mm (±0.95) respectively. Optic strut attachment to sphenoid body was predominantly sulcal as in 52 cases (54.74%) and was most frequently attached to anterior 2/5(th) of anterior clinoid process, seen in 93 sides (48.95%). Pneumatisation of optic strut occurred in 23 sides. Carotico-clinoid foramen was observed in 42 cases (22.11%), complete foramen in 10 cases (5.26%), incomplete foramen in 24 cases (12.63%) and contact type in 8 cases (4.21%). Inter-clinoid osseous bridge was seen unilaterally in 4 cases.
  
  
  CONCLUSIONS
  The study assesses morphometric features and anatomical variations of paraclinoid region using MDCT 3D and multiplanar reconstructions in Indian population.
authors.affiliation: Assistant Professor, Department of Radiology, Kasturba Medical College , Attavar, Mangalore, Manipal University, India .
authors.forename: K
authors.initials: K
authors.lastname: Suprasanna
authors.affiliation: Associate Professor, Department of Pediatrics, Kasturba Medical College , Mangalore, Manipal University, India .
authors.forename: S R
authors.initials: SR
authors.lastname: Ravikiran
authors.affiliation: Professor and HOD, Department of Radiology, Kasturba Medical College , Mangalore, Manipal University, India .
authors.forename: Ashvini
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Assistant Professor, Department of Radiology, Kasturba Medical College , Mangalore, Manipal University, India .
authors.forename: Channabasappa
authors.initials: C
authors.lastname: Chavadi
authors.affiliation: Resident, Department of Radiology, Kasturba Medical College , Mangalore, Manipal University, India .
authors.forename: Sanyal
authors.initials: S
authors.lastname: Pulastya
keywords: Anterior clinoid process; Carotico-clinoid foramen; Inter-clinoidosseus bridge