Purpose of ReviewWilms tumor is the most common renal mass in infancy with peak incidence between 3 and 4 years old. Actual cure rates are around 90%. Current COG recommendations for imaging follow-up after treatment still include abdomino-pelvic CT for the first 18 months in a regimen that totals at least eight follow-up CTs before changing to US examinations. That represents a meaningful radiation exposure in patients who are more susceptible to stochastic effects, due to their low age.