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Fig. 2B —Complex benign cystic renal mass (stable at 24-month follow-up) on right kidney in 47-year-old woman. Longitudinal contrast-enhanced sonography images obtained by contrast-specific mode Cadence Contrast Pulse Sequencing (Acuson–Siemens Medical Solutions). Software suppresses tissue background, with almost complete cancellation of intracystic septa with evidence of only slight enhancement in thin intracystic septa (arrow, B) during arterial phase (B). Cystic lesion (arrow, C) was classified as benign after review of contrast-enhanced sonography scan (C). Transverse contrast-enhanced CT image of right kidney obtained during nephrographic phase shows evident septa and intracystic septal calcification. Lesion was classified as Bosniak IIF lesion. Cystic lesion underwent imaging follow-up on CT, which revealed no increase in diameter and no change in morphology or contrast enhancement.