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Renal primitive neuroectodermal tumor: an immunohistochemical and cytogenetic analysis
T Takeuchi1, H Iwasaki, Y Ohjimi
1Department of Pathology, Fukuoka University, School of Medicine, Japan.
This case study presents a rare primitive neuroectodermal tumor (PNET) of the kidney in a young man. Cytogenetic analysis, specifically karyotyping, proved crucial in diagnosing this renal PNET and differentiating it from Wilms' tumor.
Area of Science:
- Oncology
- Genetics
- Pathology
Background:
- Primitive neuroectodermal tumors (PNETs) are rare malignancies.
- Renal PNETs are exceptionally uncommon, posing diagnostic challenges.
Observation:
- A 22-year-old male presented with a left renal mass, inferior vena cava tumor embolus, and pulmonary metastases.
- Histopathology revealed small round cells with Homer-Wright rosettes.
- Immunohistochemistry showed PNET/Ewing's sarcoma specific markers (HBA71) and neural markers.
Findings:
- Cytogenetic analysis identified a specific translocation t(11;22)(q24;q12), characteristic of PNET and Ewing's sarcoma.
- The tumor cells expressed neural markers and vimentin, with negative epithelial and muscular markers.
Implications:
- Karyotyping is a valuable diagnostic tool for renal PNET.
- This technique aids in distinguishing renal PNET from other small round cell tumors, including Wilms' tumor.
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