Idiopathic sclerotic inflammation of the orbit with left optic nerve compression in a patient with multifocal fibrosclerosis

We present the MR imaging findings in a. 43-year-old male patient with bila teral idiopathic sclerosing inflammation of the orbit. Bilateral enhancing retrobulbar masses, with concentric compression of the retrobulbar segment of the left optic nerve, were seen. MR imaging proved to be the only means to distinguish between the different intraorbital structures and to determi ne the exact site of optic nerve compression. To our knowledge, this is the first documented case of MR imaging findings of this entity.