Fig. 2From: Active surveillance of small renal massesThe main differences between active surveillance (AS) and watchful waiting (WW) in the monitoring of small renal masses. Active surveillance is defined as the initial management including the monitoring of renal tumor size by serial imaging with delayed treatment in case of progression. In WW, close monitoring with imaging techniques is not routine, curative treatment is not administered, and active treatment is only indicated on the appearance of symptomsBack to article page