Fig. 1

Imaging characteristics of the tumour. A Ultrasound image of this case. Ultrasound showed an isoechoic area at the lower pole of the right kidney, with a size of 1.6 × 1.3 cm, a clear boundary, and an uneven echo; it was slightly convex locally, and the blood flow signal could be seen. B Enhanced CT of the lower abdomen displayed a solid space occupying the right kidney