Follow-Up Imaging for Nonobstructing Renal Stones

Stone Size and Management Context

• The European Association of Urology (EAU) guidelines support active surveillance for asymptomatic, nonobstructing caliceal stones up to 15 mm 1, 2, 3
• The American Urological Association (AUA) and European Society (ES) guidelines recommend follow-up imaging for patients choosing active surveillance of asymptomatic nonobstructing renal calculi 1, 2, 3

Critical Monitoring Points

• Stone growth on serial imaging requires more urgent intervention, according to the American Urological Association (AUA) guidelines 1, 2
• Associated infection is an indication for more urgent intervention, as recommended by the European Association of Urology (EAU) guidelines 1, 2

Common Pitfalls to Avoid

• Avoid using different imaging modalities interchangeably for size comparison, as this reduces accuracy in assessing stone growth, according to the National Institute of Health (NIH) guidelines 4