By Brad W. Neville, DDS, Director of Oral and Maxillofacial Pathology, HCA South Atlantic Division, Trident Medical Center, Charleston, South Carolina, Distinguished University Professor Emeritus, Department of Stomatology, James B. Edwards College of Dental Medicine, Medical University of South Carolina, Charleston, South Carolina; Douglas D. Damm, DDS, Emeritus Professor, Division of Oral & Maxillofacial Pathology, University of Kentucky College of Dentistry, Lexington, Kentucky, Oral & Maxillofacial Pathologist, Pathology & Cytology Laboratories, Lexington, Kentucky; Carl M. Allen, DDS, MSD, Division of Oral and Maxillofacial Pathology and Radiology, College of Dentistry, The Ohio State University, Columbus, Ohio and Angela C. Chi, DMD, Professor, Woody L. Hunt School of Dental Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas