Results: Mean distance between the anterior nasal spine and the posterior wall of sphenoid sinus, carotid artery protuberance, optic protuberance, lateral opticalcarotid recess was 79, 05± 7, 72 mm, 76, 18 ± 4, 58 mm, 75, 2 ± 5, 79 mm, 79, 4 ± 6, 04 mm.