Renal ectopia: Difference between revisions
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* Crossed ectopy = kidney located on the opposite side of the midline from its ureter. | * Crossed ectopy = kidney located on the opposite side of the midline from its ureter. | ||
* In 90% of crossed ectopy, there is at least partial fusion of the kidneys (the remainder demonstrate two discrete kidneys on the same side, crossed-unfused ectopy) | * In 90% of crossed ectopy, there is at least partial fusion of the kidneys (the remainder demonstrate two discrete kidneys on the same side, crossed-unfused ectopy) | ||
* Due to improper renal ascent in embryogenesis ( | * Due to improper renal ascent in embryogenesis (4<sup>th</sup>-8<sup>th</sup> week of fetal life - normally, the kidney reaches its appropriate position at L2 level at the end of the 2<sup>nd</sup> month) | ||
* Fusion of the kidneys within the pelvis leads to crossed-fused renal ectopia. | * Fusion of the kidneys within the pelvis leads to crossed-fused renal ectopia. | ||
* Abnormally situated umbilical artery prevents normal cephalic migration. Another theory is that the ureteric bud crosses to the opposite side and induces nephron formation in the contralateral metanephric blastema. | * Abnormally situated umbilical artery prevents normal cephalic migration. Another theory is that the ureteric bud crosses to the opposite side and induces nephron formation in the contralateral metanephric blastema. | ||
Revision as of 20:57, 14 March 2009
| Renal ectopia | |
| ICD-10 | Q63.2 |
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| ICD-9 | 753.3 |
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Renal ectopia or ectopic kidney describes a kidney that is not located in its usual position. It results from the kidney failing to ascend from its origin in the true pelvis or from a superiorly ascended kidney located in the thorax.
Crossed-fused renal ectopia
- Crossed ectopy = kidney located on the opposite side of the midline from its ureter.
- In 90% of crossed ectopy, there is at least partial fusion of the kidneys (the remainder demonstrate two discrete kidneys on the same side, crossed-unfused ectopy)
- Due to improper renal ascent in embryogenesis (4th-8th week of fetal life - normally, the kidney reaches its appropriate position at L2 level at the end of the 2nd month)
- Fusion of the kidneys within the pelvis leads to crossed-fused renal ectopia.
- Abnormally situated umbilical artery prevents normal cephalic migration. Another theory is that the ureteric bud crosses to the opposite side and induces nephron formation in the contralateral metanephric blastema.