A 36-year-old woman was admitted with a left abducens nerve palsy. MR showed enlargement of the left cavernous sinus. The patient was treated with 80 mg oral methyl prednisolone. Clinical findings improved within a month. Two months later, she was readmitted with left oculomotor and right abducens nerve palsy. MR showed significant increase in the volume of the abnormal area in the left cavernous sinus and a new lesion within the right cavernous sinus. After intravenous gadolinium DTPA, there was enhancement in both cavernous sinuses. Methyl prednisolone therapy was again started. After one month of treatment neurological examination was normal. Follow-up MR findings were similar to previous ones.