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Lumbosacral ectopic nephrogenic rest unassociated with spinal dysraphism
Marcelo G Horenstein1, Elizabeth A Manci, Andrew B Walker
1Department of Pathology, University of South Alabama College of Medicine and Medical Center, 2451 Fillingim Street, Mobile, AL 36604, USA. horenstein@pol.net
The American Journal of Surgical Pathology
|September 17, 2004
Summary
A rare ectopic nephrogenic rest (NR), a precursor to Wilms' tumor, was found in a newborn's lumbosacral area. This case highlights the varied presentations of these precursor kidney lesions.
Area of Science:
- Pediatric Pathology
- Developmental Biology
- Nephrology
Background:
- Nephrogenic rests (NRs) are recognized precursor lesions for Wilms' tumor (WT), typically found within the kidney.
- These rests can occasionally occur in ectopic locations, presenting diagnostic challenges.
Observation:
- A case of a midline lumbosacral ectopic NR in a healthy newborn is presented.
- The lesion appeared as a polypoid mass without associated spinal abnormalities on MRI.
- Histological examination revealed blastema, mature tubules, and stroma, consistent with NR.
Findings:
- This report details a rare instance of an ectopic NR in the lumbosacral region.
- The NR was unassociated with spinal dysraphism, differentiating it from previously reported cases.
- The presence of heterotopic nephrogenic tissue raises questions about its pathogenesis and potential for progression.
Implications:
- This finding expands the known spectrum of NR locations and presentations.
- Understanding the nature of ectopic NRs is crucial for determining appropriate clinical follow-up.
- Further research into the pathogenesis of heterotopic nephrogenic tissue is warranted to clarify neoplastic potential.