Inflammatory orbital pseudotumor.

1. Inflammatory orbital pseudotumor, a term used to describe any idiopathic inflammatory lesion of orbital tissue that simulates a neoplasm of the orbit, is a definite clinical entity masquerading in various forms and covering a wide spectrum of periocular lesions. 2. Inflammatory orbital pseudotumor has a good prognosis with steroid therapy. Once it is suspected, prompt and effective treatment must be given as soon as possible, even before laboratory work-up has been completed. 3. A great deal of investigative study must be done to rule out any other life-threatening diseases. Long-term follow-up is mandatory because malignant or monoclonal transformation is possible.