Abstract
Axial tomography of the optic canals utilizing hypocycloidal polytomography is a simple method of investigation of lesions in and around the optic canal in children. This roentgenographic projection can be accurately reproduced in the serial investigation of patients, and both optic canals are demonstrated simultaneously. With the addition of air into the chiasmatic cisterns, axial tomography facilitates the investigation of parasellar mass lesions but is inaccurate in determining intracranial extension of optic nerve gliomas because of associated adhesions.
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