Figure 2: Six subtypes of crossed fused renal ectopia. A- Inferior ectopia type with upper pole of ectopic kidney fusing with lower pole of normal kidney. B- Sigmoid or S-shaped kidney where hilum of ectopic kidney faces laterally and that of normal kidney medially and with fusion form S-shaped mass. C- Lump kidney with fusion of two kidneys over a wide margin with ureter from ectopic kidney crossing the midline. D- L-shaped or Tandem kidney in which the ectopic kidney is placed horizontally fusing with lower pole of normal kidney. E- Disc kidney with extensive fusion of two kidneys forming a disc shaped mass. F- Superior ectopia type with ectopic kidney placed above the normal kidney and fusing with its upper pole.