Cross ectopic kidney with or without fusion

When the kidney is located in the renal fossa on the opposite side of the kidney, it is referred to as renal ectopic. More than 90% of ectopic kidneys fuse with their normal kidneys on the opposite side, and are most common in horseshoe kidney deformities. The concept of fused renal abnormalities was first proposed by Wilmer in 1938, and Mcdonald extended the concept in 1957 to include renal ectopic with or without ectopic fusion. The main types of fused kidney are as follows: ① fused kidney with inferior heterotopy; ② C-shaped or S-shaped fused kidney; ③ block or cake-shaped fused kidney; ④ L-shaped fused kidney; ⑤ round fused kidney; ⑥ fused kidney Heterotopic head.