Syed Z. Ali, MD, FRCPath, FIAC is Professor of Pathology and Director of Cytopathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland. Ritu Nayar, MD, Professor of Pathology, Northwestern University, Feinberg School of Medicine, Director of Cytopathology, Northwestern Memorial Hospital, Chicago, IL Jeffrey F. Krane, MD, PhD, Associate Professor of Pathology, Associate Director, Cytology Division, Chief, Head and Neck Pathology Service, Brigham and Women's Hospital, Harvard Medical School, Boston, MA William H. Westra, MD Professor of Pathology, Oncology, and Otolaryngology-Head and Neck Surgery, The Johns Hopkins Hospital, Baltimore, MD