Figure 2b. Renal hematoma in a 69-year-old man with abdominal pain. (a) Unenhanced CT scan shows a 10-cm-diameter heterogeneously hyperattenuating (46 HU) renal mass (arrows) with linear calcifications at its center and periphery. (b) Contrast-enhanced CT scan obtained during the nephrographic phase reveals no enhancement of the mass (arrows). A renal hematoma was found at nephrectomy.