Barbara Ann Centeno is Vice Chair of Clinical Services, Assistant Chief, Pathology Service, Director of Cytopathology, and Senior Member of the Department of Anatomic Pathology, H. Lee Moffitt Cancer Center and Research Institute, and Professor, Clinical Oncologic Sciences, Morsani College of Medicine at the University of South Florida, Tampa. Edward B. Stelow is Associate Professor, Department of Pathology, University of Virginia, Charlottesville. Martha Bishop Pitman is Medical Director of the Cytopathology Laboratory, Massachusetts General Hospital, and Associate Professor of Pathology, Harvard Medical School, Boston.