Echographic features of tilted optic disk.

Unusual echographic features of the optic nerve were observed in four cases of tilted disk syndrome. A-scan ultrasonography revealed an increase in the dural diameter of the optic nerve (average, 8.5 microseconds), and B-scan ultrasonography showed an accentuation and doubling of optic nerve outline, which is a feature of optic neuropathy. The probable cause for these echographic features is the abnormal configuration of the nerve.