Fig. 2

Abdominal computed tomography (CT). a–c Post-enhancement CT shows a hyperdense mass of 2.62 × 5.70 cm in the right renal pelvis. This mass did not obstruct UPJ directly, and the ureter below the stone was dilated. a Transverse view. b Sagittal view. c Coronal view. d Another section of the transverse view of the CT shows dense lines (red arrows) in the dilated right renal pelvis, suggesting septa