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Updated: Oct 5, 2025
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Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
Published on: April 12, 2019
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A Case of Telangiectatic Osteosarcoma in the Frontal Bone
Youhei Takeuchi1, Shinya Sonobe1, Naoya Iwabuchi1
1Department of Neurosurgery, Osaki Citizen Hospital, Osaki, Miyagi, Japan.
NMC Case Report Journal
|January 26, 2022
Summary
Telangiectatic osteosarcoma (TOS), a rare bone cancer subtype, was diagnosed in an elderly woman's frontal bone. Early histopathological diagnosis and complete resection are crucial for this rare condition.
Area of Science:
- Oncology
- Pathology
- Radiology
Background:
- Telangiectatic osteosarcoma (TOS) is a rare subtype of osteosarcoma.
- TOS occurring in the skull and in elderly patients is exceptionally uncommon.
Observation:
- A 79-year-old woman presented with a right frontal bone lesion initially diagnosed as an intradiploic epidermoid cyst (IEC).
- The lesion evolved into a 60mm cystic mass with bone destruction over five years, exhibiting hemorrhagic, non-clotting fluid.
- Initial diagnosis was revised to aneurysmal bone cyst (ABC) before final confirmation of TOS.
Findings:
- Histopathology revealed fibrous connective tissue without epithelial components, ruling out IEC.
- Immunohistochemistry showed a high MIB-1 index (50%) and atypical cells with osteogenic properties, confirming TOS.
- Postoperative MRI confirmed no residual lesion or metastasis.
Implications:
- This case highlights the diagnostic challenges of rare skull-based TOS in the elderly.
- Emphasizes the importance of thorough histopathological examination for accurate diagnosis of cystic bone lesions.
- Complete surgical resection is vital for managing TOS to prevent recurrence and metastasis.
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