Hyperdense Renal Cyst Due to Prolonged Retention of Iodinated Contrast Material: Case Report

A case of a hyperdense renal cortical cyst resulting from cyst puncture and opacification 28 months previously is reported. Prolonged retention of water-soluble iodinated contrast material is an unusual cause of a hyperdense renal cyst, which has not previously been described. The findings on serial computed tomography (CT) and chemical analysis are presented and discussed.