“…For example, around 400 thyroidectomies are performed annually at the Hospital das Clínicas of the Faculdade de Medicina at Universidade de São Paulo (HCFMUSP) and at the Instituto do Câncer do Estado de São Paulo (ICESP), 74% of these cases due to cancer. Considering the best indicators of definitive hypoparathyroidism incidence published, ranging from 1 to 4.2% 1,2,12,13 , we would have 4 to 16 new cases per year only in our services, however, this figure may be even higher, considering the cases in which therapeutic neck dissection was also carried out.…”