The following is an excerpt....
BASICS
Description
- Renal ectopia (simple) describes a kidney outside of the normal position in the renal fossa and on the proper side of the body:
- Pelvic kidney is the most common location.
- Crossed renal ectopia describes the condition in which the kidney is located on the opposite side of where the ureter inserts:
- In these cases, the ectopic renal unit is almost always fused to the opposite renal unit (90%) (cross-fused renal ectopia).
- This is distinct from the horseshoe kidney, the most common renal fusion anomaly
Epidemiology
- Simple renal ectopia:
- 1 in 500
- 1 in 2,000–3,000 (pelvic renal ectopia)
- Increased incidence on the left
- Crossed renal ectopia is extremely rare, with no good epidemiologic data available ...
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