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Postirradiation sarcoma of the sphenoid bone--a case report
Wan-Yee Teo1, Henry K K Tan, Boon-Cher Goh
1Department of Paediatric Medicine, Kandang Kerbau Women's and Children's Hospital, Singapore.
Annals of the Academy of Medicine, Singapore
|March 28, 2006
Summary
This case report details the first instance of malignant fibrous histiocytoma in the sphenoid bone, a rare secondary tumor developing after radiation therapy for nasopharyngeal carcinoma.
Area of Science:
- Oncology
- Radiation Oncology
- Medical Imaging
Background:
- Secondary tumors following radiation therapy are a rare but serious complication.
- Nasopharyngeal carcinoma (NPC) is often treated with radiotherapy.
- Sphenoid bone tumors are exceptionally uncommon post-treatment sequelae.
Observation:
- A 45-year-old male developed a postirradiation sarcoma of the sphenoid bone.
- This occurred less than 5 years after radiation therapy for Stage T3N1M0 nasopharyngeal carcinoma.
- The specific diagnosis was malignant fibrous histiocytoma.
Findings:
- This represents the first reported case of postirradiation malignant fibrous histiocytoma of the sphenoid bone.
- Previous literature documented only one other sphenoid bone tumor (osteosarcoma) after radiation, but for a different primary cancer (craniopharyngioma).
- Out of approximately 3000 patients treated for NPC over 10 years in Singapore, only one developed a postirradiation sphenoid tumor.
Implications:
- This case highlights the potential for rare secondary malignancies in the sphenoid bone following nasopharyngeal carcinoma radiotherapy.
- It underscores the importance of long-term surveillance for patients treated with radiation therapy.
- Further research is needed to understand the risk factors and mechanisms of radiation-induced sarcomas in this specific anatomical location.