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Multinodular hyperplastic pannephric nephroblastomatosis with tubular differentiation: a new morphologic variant
J J Regalado1, M M Rodriguez, J B Beckwith
1Division of Pediatric Pathology, Jackson Memorial Medical Center, University of Miami School of Medicine, Florida 33101, USA.
Summary
This study describes a rare case of bilateral nephromegaly in an infant, presenting as enlarged, nodular kidneys and rapid renal failure. The findings suggest a potential new morphologic variant of universal nephroblastomatosis.
Area of Science:
- Pediatric Nephrology
- Developmental Biology
- Pathology
Background:
- Prenatal detection of bilateral nephromegaly and oligohydramnios presents diagnostic challenges.
- Understanding congenital kidney abnormalities is crucial for early intervention and management.
Observation:
- A male infant presented with bilateral nephromegaly detected prenatally, oligohydramnios, and rapidly progressing renal failure post-delivery.
- Gross examination revealed kidneys three times normal size, diffusely multinodular, with hypoplastic calyces and absent corticomedullary demarcation.
- Histopathology showed hyperplastic embryonal rests with extensive tubule/duct branching, intermixed with mature parenchyma exhibiting oxalosis.
Findings:
- Flow cytometry indicated diploid rests with a significant S-phase fraction (25.9%), suggesting proliferative activity.
- The observed renal pathology is attributed to abnormal, excessive branching of embryonal collecting system analogs from the ureteric bud.
- This unique presentation may represent a novel morphologic variant of universal nephroblastomatosis.
Implications:
- This case expands the spectrum of known congenital kidney disorders.
- Further research into the genetic and developmental mechanisms underlying such embryonal rest proliferation is warranted.
- Highlights the importance of detailed histopathological analysis in diagnosing complex pediatric renal conditions.