Bilateral idiopathic inflammatory pseudotumor of the orbits.

Four cases of bilateral orbital idiopathic inflammatory pseudotumors are analysed as regards their clinical, CT and ultrasonographic features. Bilateral orbital involvement tends to occur in a younger age group while optic nerve involvement is invariable. Certain echographic features like variation of angle kappa, increase in the width of retrobulbar fat complex and decreased orbital pulsations on M-scan are highlighted.