Figure 4.

(a) Axial CT scan demonstrating a small tumour on the anterior aspect of the right kidney (red arrow). (b) Schematic colouring of CT scan to demonstrate the position of a tumour (red circle) and renal parenchyma anterior (blue) or posterior (green) to the avascular plane of Brödel denoted by the dotted yellow line X–Y. The tumour is located in the area served by the anterior division (blue), the branches of which supply the region of the tumour