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November 1977

Anatomic Considerations for Computed Tomography of the Optic Chiasm

Arch Neurol. 1977;34(11):713-714. doi:10.1001/archneur.1977.00500230083015

• 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° and 25° or 35° 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.