Neuroradiological examinations in optic neuropathies.

The advantages and limits of both CT and NMR imaging of optic nerve lesions are outlined and some examples are produced. Advantages of CT scanning are high resolution, multiplane reconstruction, quickness of examination, reliability, whereas the limits are the presence of artifacts from contiguous bone structures, the use of enhancement media and radiation damage. NMR is superior to CT scanning for detection of soft tissue lesions and possibility of multiplane scanning, but duration and high costs of the examination and some artifacts caused by ocular movements are limits to be taken into account. Both the techniques provide useful complementary information for the diagnosis of orbital lesions involving the optic nerve.