Orbital pseudotumor of the levator muscle.

A 58-year-old white man with chronic progressive external ophthalmoplegia developed proptosis and an improvement in his ptosis from a mass in the superior orbit. A biopsy showed the mass to consist of an inflammatory mass of the levator palpebrae superioris muscle. As the inflammatory mass responded to periorbital and systemic steroids, the ptosis recurred. Inflammatory pseudotumor of the levator muscle is extremely unusual and has not been reported previously in patients with chronic progressive external ophthalmoplegia.