A complete update of a classic reference by specialists at the Mayo Clinic, Henderson's Orbital Tumors, Fourth Edition collates the Clinic's fifty years' experience in managing tumors involving the orbit. Drawing on case reports and extensive follow-up data from over 1,700 patients treated at the Clinic, the authors formulate comprehensive guidelines on diagnosis and medical and surgical treatment of the entire spectrum of orbital tumors. This new edition reflects the latest advances in diagnosis and treatment, including improved imaging technology, more accurate pathologic diagnosis, new radiotherapy options, new surgical approaches, and therapy using monoclonal antibodies. More than 460 illustrations, 43 in full color, complement the text.