PMC5198151_01
Noncontrast CT scan: water density renal mass, compatible with a simple renal cyst.
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fig1
Without contrast the CT revealed a well-defined limit, water density mass (15-17 HU) (Figure 1).
Contrast-enhanced CT scan (corticomedullary phase): complex cyst compatible with a Bosniak III cystic renal mass.
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fig2
These findings were consistent with a Bosniak type III lesion (Figure 2).