Serial magnetic resonance imaging was central to active surveillance in prostate cancer, enabling noninvasive monitoring of tumor size, conspicuity, and progression, with the PRECISE scoring system providing a standardized framework for assessing radiologic change. Researchers emphasized that consistent measurement of tumor volume over time—preferably by a single observer reviewing all prior scans—offers more clinically meaningful data than diameter alone and should guide decisions on biopsy and treatment initiation.

Source: Radiology