Fig. 5From: Active surveillance of small renal massesIndeterminate renal mass by CT in an 82-year-old patient. a Axial unenhanced and (b) enhanced CT showing a renal mass with attenuation greater than 20 HU in unenhanced CT that enhances less than 20 HU after contrast administration, considered indeterminate by CT (arrows). c Unenhanced and (d) contrast-enhanced ultrasound (US) of the same lesion clearly depicting enhancement of this lesion consistent with a solid renal tumor (arrows), thereby allowing an indeterminate CT renal mass to be reliably classified as a solid massBack to article page