Bosniak classification system of renal cystic masses divides renal cystic masses into five categories based on imaging characteristics on contrast-enhanced CT. It is helpful in predicting a risk of malignancy and suggesting either follow up or treatment:

Bosniak 1 – simple cyst

Bosniak 2 – minimally complex cyst less than 3 cm, with a few thin septa

Bosniak 2F – minimally complex cyst greater than 3 cm, with an increased number of thickened septa

Bosniak 3 – indeterminate

Bosniak 4 – clearly malignant

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