Gadopentetate dimeglumine-enhanced MR in the diagnosis of the Tolosa-Hunt syndrome.

A 54-year-old man first was admitted with a right oculomotor nerve palsy that ameliorated spontaneously. Two months later, he was readmitted with right proptosis, ophthalmoplegia, and optic nerve involvement. MR showed an enlarged right cavernous sinus. There was dramatic improvement after high doses of steroids. MR findings 10 months later were normal. Thus, the diagnosis of the Tolosa-Hunt syndrome was established.