title: Anatomic considerations for computed tomography of the optic chiasm.
abstract: When the clinical distinction between lesions of the optic nerves or the chiasm is not apparent, computed tomographic scans should be performed at both 0 degrees and 25 degrees or 35 degrees to the orbital-meatal line (Reid's baseline). The former plane is preferable for the demonstration of the optic nerves or orbital structures, while the latter allows superior visualization of perichiasmatic structures.
mesh_terms: D005260:Female; D006801:Humans; D008875:Middle Aged; D009897:Optic Chiasm / Q000000981:diagnostic imaging*; D010911:Pituitary Neoplasms / Q000150:complications / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014786:Vision Disorders / Q000209:etiology