Radiation-Induced Intraosseous Malignant Peripheral Nerve Sheath Tumor: A Case Report.

Area of Science:

• Oncology
• Radiation Oncology
• Pathology

Background:

• Radiation therapy is vital for cancer treatment but carries risks of complications.
• These complications include fibrosis, osteonecrosis, and secondary malignancies.
• Malignant peripheral nerve sheath tumors (MPNSTs) are a rare but serious secondary malignancy.

Purpose of the Study:

• To highlight the challenges in diagnosing secondary malignancies after radiation therapy.
• To emphasize the importance of recognizing MPNSTs as a potential complication.
• To underscore the need for careful histological evaluation in post-radiation surveillance.

Main Methods:

• Case report of a 47-year-old male with a history of tongue cancer treated with radiation therapy.
• Presentation of symptoms leading to the discovery of an intraosseous MPNST.
• Histopathological and immunohistochemical analysis of the tumor.

Main Results:

• Histopathology revealed characteristic MPNST features: spindle cells, hypercellular/hypocellular areas, atypical nuclei, and high mitotic activity.
• Immunohistochemistry showed patchy S100 and SOX10 staining, with a loss of H3K27me3 expression.
• The case illustrates diagnostic challenges of secondary malignancies post-radiation.

Conclusions:

• Radiation-induced secondary malignancies are significant late effects of cancer treatment.
• MPNST is a pertinent example of a challenging secondary malignancy.
• A high index of suspicion and thorough histological examination are essential for post-radiation surveillance and management.