There is a large lobulated heterogeneous density mass lesion with areas of necrosis/cystic density arising from a horseshoe kidney (involving the right kidney more than the left by claw sign). It compresses the right renal pelvis resulting in moderate hydronephrosis. The right kidney itself appears hypoattenuating in comparison with the left one, probably due to a delayed nephrogram. There is a suspicious of anterior abdominal wall invasion, as well as of the right liver lobe. The mass compresses the adjacent vessels without invasion or tumoral thrombus. There is non-specific mild stranding of the surrounding fat planes. Features are in keeping with a Wilms tumour.