Fig. 4

An incidentally identified hyperdense right renal cyst in a 72-year-old man. Axial TNC image shows a markedly hyperdense cyst, most consistent with a hemorrhagic cyst (a) without enhancement on the portovenous phase image (b). However, iodine overlay maps show suspected mild enhancement (c). The iodine content of the cyst was 1.3 mg/mL, which by accepted thresholds would be considered an enhancing lesion, however, the normalized iodine content was only 0.27 mg/mL, consistent with lack of enhancement seen on conventional images