Ewing sarcoma of the kidney: a rare entity
Maria Fernanda Arruda Almeida1, Madhavi Patnana2, Brinda Rao Korivi2
1Diagnostic Radiology Resident, A. C. Camargo Hospital, Sao Paulo, SP, Brazil.
Case Reports in Radiology
|February 14, 2014
Summary
Primitive peripheral neuroectodermal tumors (PNET) are rare in the kidney, presenting diagnostic challenges in urologic malignancies. Early diagnosis and multimodal treatment are crucial, though metastatic disease prognosis remains poor.
Area of Science:
- Pediatric Oncology
- Urologic Pathology
- Molecular Diagnostics
Background:
- Ewing sarcoma and primitive peripheral neuroectodermal tumors (PNET) are high-grade malignant small round cell tumors of neuroectodermal origin.
- Primarily affecting children and adolescents, primary renal PNET is a rare entity.
- Renal PNET often presents with nonspecific symptoms like hematuria and abdominal pain, with uncharacteristic imaging findings.
Purpose of the Study:
- To highlight the rarity and diagnostic challenges of primary renal PNET in urologic malignancies.
- To emphasize the diagnostic modalities for PNET.
- To discuss the treatment and prognosis of renal PNET.
Main Methods:
- Histopathology
- Immunohistochemistry
- Molecular pathology
Main Results:
- Diagnosis relies on a combination of histology, immunohistochemistry, and molecular pathology.
- Multimodal treatment is indicated upon diagnosis.
- Metastatic disease carries a poor prognosis despite treatment.
Conclusions:
- Primary renal PNET is an infrequent differential diagnosis in urologic oncology.
- Accurate diagnosis requires integrated histopathologic, immunohistochemical, and molecular analyses.
- Aggressive multimodal therapy is necessary, but outcomes for metastatic disease remain challenging.
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