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Extrarenal Wilms' tumor.

E T Fernandes1, M Kumar, E C Douglass

  • 1Department of Surgery, LeBonheur Children's Medical Center, Memphis TN.

Journal of Pediatric Surgery
|May 1, 1989
PubMed
Summary
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Extrarenal Wilms' tumors are rare, with only 19 documented cases. This study reports three new cases, two associated with horseshoe kidneys, suggesting a potential diagnostic link for retroperitoneal masses.

Area of Science:

  • Pediatric Oncology
  • Nephrology
  • Embryology

Background:

  • Wilms' tumor, a common pediatric kidney cancer, typically occurs within the kidney.
  • Extrarenal Wilms' tumor (nephroblastoma) is exceptionally rare, with limited reported cases.

Observation:

  • This study details three new cases of isolated extrarenal nephroblastoma.
  • Two of these patients also had horseshoe kidneys, a congenital anomaly where the kidneys are joined at the lower poles.

Findings:

  • The association of extrarenal nephroblastoma with horseshoe kidneys may stem from shared embryologic origins in primitive mesodermal tissues.
  • Tumor location cephalad to a horseshoe kidney supports an origin from mesonephric rests rather than metanephric remnants.

Implications:

Related Experiment Videos

  • The co-occurrence of horseshoe kidneys and retroperitoneal masses should raise suspicion for extrarenal nephroblastoma.
  • Patients diagnosed with extrarenal nephroblastoma, particularly with associated anomalies, should follow established treatment protocols for intrarenal Wilms' tumor.