Fig. 6From: Active surveillance of small renal massesSolid renal masses in two elderly patients with regular and irregular borders. a Axial contrast-enhanced CT in the arterial phase shows a hyperdense right renal mass with smooth margins and regular shape (arrow) which, if indicated, can be managed with active surveillance. b Axial contrast-enhanced CT scan in the nephrographic phase depicting a hypodense renal mass with irregular borders (arrow). Active surveillance is not indicated in this caseBack to article page