Please select the correct Bosniak classification:

I  

II      

IIF      

III      

IV          

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Notes:

I: Benign simple cyst with a hairline thin wall without septa, calcification, or solid component. Homogeneous near-water attenuation density (-10 to 20 HU) without enhancement. 

II: Benign minimally complicated cyst that may contain a few hairline thin septa that may have “perceived” but not measurable enhancement. Fine calcification or a segment of slightly thickened calcification may be present in the wall or septa. Also, a well-marginated nonenhancing homogeneous mass <3 cm with density above simple fluid attenuation (hyperdense cyst).

IIF: Usually benign complicated renal cyst with multiple hairline thin septa or minimal smooth thickening of the wall or septa. Wall or septa may contain thick and nodular calcification and may have “perceived” but not measurable enhancement. Also, a well-marginated intrarenal nonenhancing mass >3 cm with density above simple fluid.

III: Indeterminate complicated cystic renal mass with thickened irregular wall or septa that have measurable enhancement.

IV: Malignant cystic renal mass with enhancing soft tissue components (cystic renal cell carcinoma).