Bosniak renal cyst (hemorrhagic cyst) - type II

Case contributed by Dr Usman Bashir


Patient with an incidental finding.

Patient Data

Age: 82
Gender: Female

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.

Case Discussion

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.

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Case information

rID: 18823
Published: 23rd Jul 2012
Last edited: 14th Aug 2019
System: Urogenital
Inclusion in quiz mode: Excluded

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