CT Hyperdense ? Hemorrhagic Cyst
CT scan without contrast in the axial plane shows an exophytic hyperdense cyst in the mid portion of the left kidney. The commonly found simple cyst with water density is seen posteriorly for comparison. Subsequent ultrasound and MRI confirmed the benign hemorrhagic nature of the cyst
Ashley Davidoff MD TheCommonVein.net 130706

Not All Hyperdense Lesions are Cysts

CT of an Enhancing, Hyperdense, Renal Nodule
CT through the kidneys reveal a hyperdense nodule that measured 56.HU. Following contrast, the density of the nodule increased to 101.8 HU. An enhancing mass in the kidney is highly suspicious for a renal cell carcinoma
Ashley Davidoff MD TheCommonVein.net 135674