Hyperdense renal cyst

Last revised by Bálint Botz on 29 Jul 2021

Benign hyperattenuating renal cysts are also known as hyperdense renal cysts.


They are frequently found in patients with either acquired cystic renal disease or autosomal dominant polycystic renal disease 1.

Radiographic features

  • homogeneously hyperattenuating (even when a narrow CT window is used)
  • however, hyperattenuating cysts should not enhance and, therefore, cannot be diagnosed with confidence by using unenhanced CT alone 2
  • one study suggests that when a hyperdense, homogeneous, renal lesion is encountered on an unenhanced CT, with an attenuation of at least 70 HU, the probability of the mass being benign is higher than 99.9% 3

See also

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