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Diagnosing metastatic angiosarcoma arising from MPNST using H3K27me3 staining in NF1: illustrative case
Michael K A Hagan1, Robert J Spinner2, Jorge Torres-Mora3
1Mayo Clinic Alix School of Medicine, Mayo Clinic College of Medicine and Science, Rochester.
Background:
Malignant peripheral nerve sheath tumors (MPNSTs) are malignant tumors that rarely demonstrate heterologous differentiation from angiosarcomatous components. These lesions can be hard to accurately diagnose.
Observations:
A 25-year-old man with neurofibromatosis type 1 and a history of a left lumbar subcutaneous MPNST developed a lung metastasis of only the angiosarcoma component of the MPNST. Prior to H3K27me3 staining of the lung mass, there was no association of the angiosarcoma with the MPNST. Reinterpretation of the lumbar subcutaneous MPNST led to the identification of a previously unrecognized angiosarcomatous portion in that tumor as well.
Lessons:
This case highlights the importance of using H327me3 staining for accurate diagnosis of biopsies only capturing the heterologous components of MPNST. https://thejns.org/doi/10.3171/CASE251012.
Insights
Malignant peripheral nerve sheath tumors (MPNSTs) can have rare angiosarcomatous components, making diagnosis difficult. H3K27me3 staining aids in identifying these heterologous parts of MPNSTs.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Malignant peripheral nerve sheath tumors (MPNSTs) are rare and can exhibit heterologous differentiation.
- Angiosarcomatous components within MPNSTs present diagnostic challenges.
Purpose of the Study:
- To report a case of MPNST with angiosarcomatous differentiation and lung metastasis.
- To emphasize the utility of H3K27me3 staining in diagnosing MPNSTs with heterologous components.
Main Methods:
- Case study of a 25-year-old man with neurofibromatosis type 1 and MPNST.
- Histopathological re-evaluation of primary tumor and lung metastasis.
- Immunohistochemical staining, including H3K27me3, was performed.
Main Results:
- A lung metastasis was identified, containing only the angiosarcoma component of the MPNST.
- Re-examination revealed a previously unrecognized angiosarcomatous area in the primary lumbar MPNST.
- H3K27me3 staining was crucial for correctly identifying the angiosarcomatous component.
Conclusions:
- Accurate diagnosis of MPNSTs with heterologous components requires careful pathological examination.
- H3K27me3 staining is a valuable tool for identifying angiosarcomatous differentiation in MPNSTs.
- This case underscores the importance of considering rare histological variants in MPNST diagnosis.
