Crossed renal ectopia

Different forms of crossed renal ectopia.

Fused – Ectopic kidney moves across the midline and fuses to the lower pole of the normally positioned contralateral kidney.
Nonfused – Ectopic kidney moves across the midline without fusion and is positioned at the rim of the pelvis (pelvic kidney).
Bilateral – Both kidneys are ectopic and cross the midline with the ureters maintaining their normal bladder insertion.

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