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Neuroimaging of the optic nerve after fenestration for management of pseudotumor cerebri.

To the Editor. —Hamed et al, 1 in their fine May 1992 article, describe the magnetic resonance (in one patient) and echographic (in two patients) appearances of a "heretofore unreported" fluid compartment extending into the orbit from the fenestration site after orbital optic nerve decompression for pseudotumor cerebri. The echographic appearance of a patent surgical subarachnoid-orbital shunt was actually shown as far back as 1976, 2 albeit using a cruder and now obsolescent echographic instrument.