Renal cyst pseudoenhancement at 16- and 64-dector row MDCT

ObjectiveTo evaluate the presence of renal cyst pseudoenhancement at 16- and 64-row multidetector computed tomography (MDCT) in patients.MethodsMDCT images from 90 patients with renal cysts > 1 cm in diameter (n= 122) were retrospectively analyzed for the presence and predictors of cyst pseudoenhancement.ResultsFifty-three percent of cysts 1–2 cm demonstrated pseudoenhancement (ranged from 11 to 35 HU). Cyst pseudoenhancement was more pronounced when imaged with 64-row CTs compared to 16-row CT. Cyst size, postcontrast renal parenchymal density, and number of scanner detector rows were independent predictors of pseudoenhancement.ConclusionPseudoenhancement occurs most frequently in patients with renal cysts < 2 cm imaged with 64-detector-row MDCT.