Localized cystic renal disease
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Innumerable small hyperdense lesions are in left kidney, less than 15mm in diameter. The mean attenuation value of mentioned cysts are about 85HU and there is no apparent enhancement on post contrast early and delayed phases.
A few non-enhanced fluid density cortical cysts also are observed at left kidney with a mean internal attenuation value of 10HU. The largest one measured about 55×42mm. A few non-enhancing simple cortical cysts also are seen in the right kidney. The renal pelvis and calyces show a normal configuration.
The urinary drainage tract is unobstructed and delayed images show symmetrical contrast excretion into the renal pelvis with no filling defect.
The features on the CT scan are the most likely compatible with unilateral and segmental localized polycystic kidney disease.