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Atypical fibroxanthoma: two unusual variants.
P R Wilson1, G M Strutton, M R Stewart
1Department of Dermatology, Royal Brisbane Hospital, Cairns, Australia.
Journal of Cutaneous Pathology
|April 1, 1989
Summary
Two rare fibroxanthoma cases showed unique features. One mimicked malignant giant cell tumor with osteoclast-like cells, while the other displayed chondroid differentiation, suggesting chondrosarcoma.
Area of Science:
- Pathology
- Oncology
- Dermatopathology
Background:
- Fibroxanthomas are rare soft tissue tumors.
- Distinguishing unusual variants from other neoplasms is crucial for accurate diagnosis and treatment.
Observation:
- Light microscopy revealed two distinct fibroxanthoma cases with atypical features.
- The first case exhibited numerous osteoclast-like giant cells, resembling malignant giant cell tumor of soft tissues, a variant of malignant fibrous histiocytoma.
- The second case presented areas of chondroid differentiation, mimicking chondrosarcoma.
Findings:
- Osteoclast-like giant cells in the first case were negative for lysozyme and alpha-1-antitrypsin.
- Tumor cells within the cartilaginous areas of the second case stained positive for S100 protein.
Implications:
- These findings highlight the diverse histological spectrum of fibroxanthomas.
- Recognizing these unusual presentations is vital for differential diagnosis in soft tissue pathology.
- Further research may elucidate the specific cellular origins and behavior of these variants.