Prof. Guido Fadda, MD, MIAC – MD University of Cagliari (Italy- 1985), Specialty in Anatomic Pathology (1990), Assistant Professor (1997) and Associate Professor of Pathology (2016) at the Catholic University of Rome. National Qualification for Full Professor of Pathology (2017). Senior Staff and Head of the Cytopathology Section at Catholic University, Foundation “Agostino Gemelli” University Hospital IRCCS of Rome. Teacher of Pathology in Medicine and Surgery Classes (in English and Italian) and several Specialty Diplomas at the Catholic University of Rome. Chair of the Committee of Cytopathology of the Italian Society of Pathology (SIAPEC-IAP). Member of the Chernobyl Tissue Bank (London, UK), USCAP, IAC and the Pirogov Society of Surgery (St. Petersburgh, Russia). Member of the editorial boards of several international journals in USA, Europe and Asia. Author of more than 150 peer-reviewed articles and 10 book chapters (including the 2017 WHO Classification of Tumors of the Endocrine System).