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. 2021 Jun 8;11(6):1058. doi: 10.3390/diagnostics11061058

Figure 2.

Figure 2

Characterization of cystic lesions. (a) Bosniak category I cyst (Simple benign cysts): B-mode US and CEUS show anechoic lesion without septa, calcification and wall irregularity; (b) Bosniak category II cyst (Minimally complex benign cysts): minimally complicated cyst with single calcific septum (arrowhead) on B-mode without recognizing enhancement on CEUS; (c) Bosniak category IIF cyst (Presumably benign, imaging surveillance is advised): on US B-mode, cyst with multiple thin septa, minimally thickened (2–3 mm), which on CEUS present minimal enhancement (arrowheads), without irregularities of both the wall and the septa; (d) Bosniak category IIF cyst (Presumably benign, imaging surveillance is advised): echogenic lesion with heterogeneous content inside (asterisk) on B-mode US, which does not show wall enhancement or septa on CEUS; (e) Bosniak category III cyst (Indeterminate lesions): on B-mode, cyst with two septa about 3 mm thick which have thickened, and irregular septa (arrowhead) on CEUS; (f) Bosniak category IV cyst (Likely malignant cystic tumors): cystic lesion with a wall nodule greater than 4 mm (arrowhead).