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Primary subcutaneous primitive neuroectodermal tumor with aggressive behavior and an unusual karyotype: case report
Gino R Somers1, Mary Shago, Maria Zielenska
1Division of Pathology, Department of Paediatric Laboratory Medicine, Hospital for Sick Children, M5G 1X8, Toronto, ON, Canada. gino.somers@sickkids.ca
Summary
This case study details an aggressive primary cutaneous and subcutaneous primitive neuroectodermal tumor/Ewing sarcoma in a teenager. The rare abdominal wall tumor showed rapid metastasis and complex genetic abnormalities, highlighting its extreme clinical behavior.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Primitive neuroectodermal tumor/Ewing sarcoma (PNET/ES) is a rare malignancy.
- Cutaneous and subcutaneous PNET/ES is exceptionally uncommon, particularly in the abdominal wall.
Observation:
- A 16-year-old female presented with primary cutaneous and subcutaneous PNET/ES of the abdominal wall.
- The tumor exhibited aggressive behavior with rapid cranial, brain, lung, and skeletal metastases despite treatment.
- Histopathological and immunohistochemical analyses revealed features typical of small round blue cell tumors, with specific markers like CD99, CD56, S100, and GFAP.
Findings:
- Ultrastructural examination showed intracytoplasmic glycogen and unique synaptic junction-like folds.
- Cytogenetic analysis revealed a complex and atypical karyotype, notably lacking the characteristic t(11;22) translocation.
- The genetic findings were distinct from typical PNET/ES, suggesting a unique molecular profile.
Implications:
- This case represents an unusually aggressive presentation of cutaneous and subcutaneous PNET/ES.
- The atypical genetic profile underscores the heterogeneity of PNET/ES and may influence treatment strategies.
- Further research into rare PNET/ES variants is crucial for understanding their unique biology and developing targeted therapies.