Orbital pseudo-tumor is a common name for idiopathic inflammatory processes in the orbit: myositis, vasculitis, pseudolimfoma and granulomatous inflammation.
Unlike thyroid ophthalmopathy, proptosis is usually unilateral. Besides proptosis, appear limited mobility of the eyeball, vision problems, and sometimes pain. For the correct diagnosis biopsy is needed sometimes.
Steroids are given systemically. Dramatic improvement usually occurs, although sometimes problems persist or even worsen. During the treatment it should be borne in mind that, as a pseudo-tumor may simulate a tumor, also a tumor may simulate a pseudo-tumor: secondary orbital inflammations caused by the real tumor will also respond well to steroid therapy.