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Figure 1: Ultrasound image (a) of the left kidney showing gross hydronephrosis with mixed echogenicity lesion in the renal pelvis. Contrast-enhanced axial computed tomography image (b) showing Grade IV hydronephrosis in left kidney with a low attenuation lesion within the dilated pelvi-calyceal system

Figure 1: Ultrasound image (a) of the left kidney showing gross hydronephrosis with mixed echogenicity lesion in the renal pelvis. Contrast-enhanced axial computed tomography image (b) showing Grade IV hydronephrosis in left kidney with a low attenuation lesion within the dilated pelvi-calyceal system