RT Book, Section A1 Vagefi, M. Reza A2 Riordan-Eva, Paul A2 Augsburger, James J. SR Print(0) ID 1144469017 T1 Orbit T2 Vaughan & Asbury's General Ophthalmology, 19e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071843539 LK accessmedicine.mhmedical.com/content.aspx?aid=1144469017 RD 2024/03/28 AB Orbital disease usually arises within the bony confines of the orbit or by spread from adjacent structures, particularly the paranasal sinuses. The etiology may be inflammation, infection, neoplasia, or vascular anomaly. An orbital mass may also be a metastatic tumor and hence a harbinger of a serious and sometimes life-threatening entity.