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Extraskeletal osteosarcoma of the scalp
P Pillay1, S Simango, D Govender
1Department of Pathology, University of Natal Medical School, Durban, South Africa.
Pathology
|June 7, 2000
Summary
This case study details a rare extraskeletal osteosarcoma of the scalp in a 56-year-old woman. The scalp tumor, confirmed by MRI, showed classical osteosarcoma features and rhabdoid cells, leading to metastatic disease post-excision.
Area of Science:
- Oncology
- Pathology
- Radiology
Background:
- Extraskeletal osteosarcoma is a rare malignant bone tumor that arises outside the skeleton.
- Scalp tumors are uncommon, and extraskeletal osteosarcoma of the scalp is exceptionally rare.
Observation:
- A 56-year-old woman presented with an 8-cm, tender, firm, exophytic scalp tumor.
- Magnetic Resonance Imaging (MRI) confirmed the absence of skeletal origin and showed subcutaneous extension.
Findings:
- Histological examination revealed classical osteogenic osteosarcoma with focal fibroblastic areas and rhabdoid cells.
- Rhabdoid cells exhibited paranuclear cytoplasmic immunoreactivity for epithelial membrane antigen.
- The patient developed metastatic disease 6 months after surgical excision and chemotherapy.
Implications:
- This case highlights the importance of considering rare diagnoses in scalp tumors.
- The presence of rhabdoid cells may indicate a specific subtype or aggressive behavior.
- Further research is needed to understand the behavior and optimal treatment of extraskeletal osteosarcoma of the scalp.