Prof. Pietro Giorgio Calo is Professor of Clinical Methodology and General Surgery in Department of Surgical Sciences at University of Cagliari, Italy. He specialized in Surgical Oncology at the University of Cagliari (1995). He is councilor of S.I.E.C. (Italian Society of Endocrine Surgery) and the Board of Associate Professors of Surgery and Vice-President of the Club of UEC (Endocrine Surgery Unit). His research interests includes thyroid surgery, Papillary thyroid cancer, parathyroid surgery, breast surgery, endocrine surgery, central node dissection, thyroid cancer, parathyroid, central neck dissection.