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Giant cell fibroblastoma associated with dermatofibrosarcoma protuberans: a case report
1Department of Pathology, Ehime Prefectural Central Hospital, Matsuyama, Japan.
Summary
Congenital giant cell fibroblastoma (GCF) and dermatofibrosarcoma protuberans (DFSP) can co-occur in pediatric patients. This case highlights their shared histogenetic origins despite differing proliferative rates.
Area of Science:
- Dermatopathology
- Pediatric Oncology
- Soft Tissue Tumors
Background:
- Congenital giant cell fibroblastoma (GCF) is a rare benign soft tissue tumor.
- Dermatofibrosarcoma protuberans (DFSP) is an intermediate-grade soft tissue sarcoma.
- Co-occurrence of GCF and DFSP is exceptionally rare, particularly in pediatric cases.
Observation:
- A case report details a 1.5-year-old girl with a congenital GCF associated with DFSP.
- Histological examination revealed distinct GCF and DFSP components.
- Immunohistochemistry showed CD34 positivity in both tumor types.
- The Ki-67 proliferation index was significantly higher in the DFSP component (4.9%) compared to the GCF component (0.5%).
Findings:
- The GCF component showed fibroblastic cells, multinucleated giant cells, and sinusoid-like spaces.
- The DFSP component exhibited spindle-shaped cells in a storiform pattern with frequent mitotic figures.
- Ultrastructural analysis confirmed fibroblastic origin for cells in both components, including giant cells.
- The findings suggest a close histogenetic relationship between GCF and DFSP.
Implications:
- This case provides insights into the potential shared origins of GCF and DFSP.
- Understanding the distinct proliferative activities is crucial for accurate diagnosis and management.
- Further research may elucidate the specific pathways involved in the development of these associated tumors.