Wednesday, October 17, 2012

Bosniak classification for Renal Cyst

Applicable to US, CT or MR imaging.



Features
Management

Bosniak I
Anechoic cyst
Thin walled
No septa, calcification, solid components
No contrast enhancement
No intervention required
Class 1 Renal cyst

Bosniak II
Hairline-thin septa
Fine calcification / Short thick calcification
No contrast enhancement
No intervention required
Class 2 Renal Cyst

Class 2. Notice the faint thin septa?
Also a smaller simple cyst in the lower pole.

Bosniak IIF
Multiple hairline-thin septae +/- minimal thickening
Minimal wall thickening
Thick / Nodular calcification
No soft tissue component
Needs follow-up

Bosniak III
Thick wall / septa, irregular / smooth
Needs surgical intervention
Class 3. Notice the thicker septa and larger size of the cyst?
Class 3 Renal Cyst

Bosniak IV
Bosniak III + soft tissue component which enhances.
Clearly malignant

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