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. 2020 May 5;11:63. doi: 10.1186/s13244-020-00853-y

Fig. 15.

Fig. 15

Bosniak IIF, differentiation between low and more complex lesions. a Axial contrast-enhanced CT depicting a large cyst with a solitary thick septum. The cyst should be followed because the septum is thick, but suspicion of malignancy is very low (arrow). b Axial contrast-enhanced CT demonstrating a cyst with multiple septa. This complex appearance does not completely rule out a possible cystic tumor (arrow)