Table 6.

Differences in recommended surveillance imaging between NCCN and ESMO guidelines

	NCCN, Version 1 2018 [3]	ESMO, 2018 [13]
Frequency	Stage 1: every 6–12 months	Low-grade STS: every 4–6 months in the first 3–5 years, then annually
	Stage II/III: every 3–6 months for 2–3 years, then every 6 months for next 2 years, then annually	Intermediate/high-grade STS: Every 3–4 months in the first 2–3 years; then twice a year up to the fifth year and once a year thereafter.
Modality	Primary site: MRI with or without contrast and/or CT with contrast or ultrasound for small, superficial lesions by an experienced ultrasonographer	Primary site: clinical assessment
	Chest: CT chest or chest X-ray	Chest: chest X-rays or CT chest at longer intervals