Table 3.

Intervals for US Examinations during Active Surveillance

Society	US evaluation
Six Italian Societies (2018)	Every 6 months in the first 2 years and once a year thereafter
ESMO (2019)	Every 6–12 months
JAES (2020)	Once or twice a year
JAES (2021)	Every 6 months in the first 1–2 years and one a year thereafter
SFE/AFCE/SFNM (2022)	Every 6 months in the first year and once a year until the end of the 5th year, then at 7 years, then every 2–3 years (level of evidence ++, Grade B)
Polish Scientific Societies (2022)	Every 6 months in the first 2 years and once a year thereafter (low quality of evidence, weak recommendation)
SBEM (2022)	Every 6 months in the first 2 years and once a year thereafter

US, ultrasonography; ESMO, European Society for Medical Oncology; JAES, Japanese Association of Endocrine Surgeons; SFE, French Society of Endocrinology; AFCE, French Association of Endocrine Surgery; SFNM, French Society of Nuclear Medicine; SBEM, Brazilian Society of Endocrinology and Metabolism.