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Fig. 20 | Insights into Imaging

Fig. 20

From: Active surveillance of small renal masses

Fig. 20

Image suspected of being a complex hemorrhagic cyst larger than 3 cm in size, which was classified as Bosniak IIF, and then later reclassified as a Bosniak II cyst by contrast-enhanced US. a Axial T2 MR showing a complex renal cyst with thick septa (arrow). b Unenhanced US of the same lesion showing cystic component and echogenic material within the cyst (arrow). c Contrast-enhanced US showing the absence of enhancement of septa (arrow). The lesion was reclassified as a Bosniak I simple cyst not requiring follow-up

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