A 78-year-old white woman noted progressively worsening headache, fluctuating decreased vision, dizziness, and binocular horizontal and vertical diplopia of two months duration. She had a 40 prism diopter exotropia and bilateral ophthalmoplegia. An initial temporal artery biopsy (TAB) was negative for findings of giant cell arteritis (GCA). Empiric prednisone was continued, and a second TAB was positive for GCA. In time there was complete resolution of the ophthalmoplegia.
