Presentation
Non-simple cyst on ultrasound. Request for further assessment.
Patient Data
Age: 45 years
Gender: Male
From the case:
Bosniak cyst - type IIF
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non-contrast

Non contrast - thin calcification of the wall and septae.
Note the enhancement enhancement of the very upper septae on the nephrographic phases, which pushes this to a 2F.
Case Discussion
Type II Bosniak cyst - as evidence by thin (1MM) calcification of the wall and septae, but without internal high attenuation, enhancement or soft tissue components.