Original ArticlesUsefulness of Nasal Morphology in Surgical Approaches for Skull Base TumorsBoyan, Neslihan PhD*; Kizilkanat, Emine PhD*; Tekdemir, Ibrahim MD†; Soames, Roger PhD‡; Oguz, Ozkan PhD*Author Information *Department of Anatomy, Faculty of Medicine, Cukurova University, Balcali-Adana †Department of Anatomy, Faculty of Medicine, Ankara University, Sıhhiye-Ankara, Turkey ‡Anatomy and Forensic Anthropology, College of Life Sciences, University of Dundee, Dundee, UK Reprints: Ozkan Oguz, PhD, Department of Anatomy, Faculty of Medicine, Cukurova University, 01330 Balcali-Adana, Turkey (e-mail: [email protected]). Neurosurgery Quarterly: December 2007 - Volume 17 - Issue 4 - p 283-286 doi: 10.1097/WNQ.0b013e31815143cd Buy Metrics Abstract Linear measurements of the nasal bones (height and width) and piriform aperture (height, upper and lower widths) were taken from 56 dry adult Anatolian skulls of unknown age and sex. The shape of the nasal bones was classified (types A to E) using the criteria outlined by Hwang et al. A new piriform aperture index (height/lower width) (types I to IV) was calculated defining its shape. The mean height and width of the nasal bones were 19.3 and 12.4 mm, respectively, with type A being observed in 39.3% of skulls, type B in 3.6%, type C in 12.5%, type D in 10.7%, and type E in 33.9%. The mean height, upper and lower widths of the piriform aperture were 36.3, 16.6, and 23.9 mm, respectively, with the shape of piriform aperture being type I in 25.0% of skulls, type II in 51.8%, type III in 10.7%, and type IV in 12.5%. Racial differences are apparent in the proportions of nasal bone types and dimensions of the piriform aperture, which must be taken into account during subcranial, transnasal, and transsphenoidal approaches of surgery for tumors involving the base of the skull. © 2007 Lippincott Williams & Wilkins, Inc.