Bosniak renal cyst (hemorrhagic cyst) - type II
Patient with an incidental finding.
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Unenhanced and portal venous phase imaging was done.
A 12 mm renal cyst with high attenuation of internal contents (80 HU to 100 HU) which does not increase further after contrast administration, compatible with hemorrhagic contents. In the absence of further findings, this can be safely left alone.
1 case question available
When facing such a lesion, the question which needs to be answered is whether this lesion is surgical or not. A study has suggested that a homogeneous mass measuring 70 HU or greater at unenhanced CT has a greater than 99.9% chance of representing a high-attenuation renal cyst. This is classified as a Bosniak type 2 cyst.