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Multiple Histological Subtypes of Dermatofibrosarcoma Protuberans Occurring in the Same Tumor
Summary
Dermatofibrosarcoma protuberans (DFSP) can present with diverse histological features, including myoid and myxoid areas. This case highlights a rare hybrid lesion with implications for diagnosis and understanding DFSP tumor biology.
Area of Science:
- Dermatopathology
- Surgical Pathology
- Oncology
Background:
- Dermatofibrosarcoma protuberans (DFSP) is a rare, low-grade cutaneous sarcoma.
- DFSP exhibits diverse histological variants, including fibrosarcomatous, pigmented, myxoid, and myoid features, which can occur independently or as hybrid lesions.
Observation:
- A case of a 66-year-old woman with a 4 cm abdominal wall tumor is presented.
- Histopathological examination revealed a hybrid lesion with typical DFSP, fibrosarcomatous transformation, myoid, and myxoid areas.
- Focal pleomorphic tumor cells and multinucleated giant cells were also noted.
Findings:
- Immunohistochemistry showed CD34 positivity in typical DFSP and myxoid areas, with negativity in some fibrosarcomatous and all myoid areas.
- Smooth muscle actin was positive in the myoid areas.
- The presence of myoid cells associated with blood vessel walls suggests a reactive nature rather than tumor differentiation.
Implications:
- This case underscores the importance of recognizing diverse histological presentations of DFSP for accurate diagnosis.
- Understanding the nature of myoid components in DFSP is crucial for differential diagnosis and patient management.
- The findings contribute to the ongoing debate regarding the origin of myoid fascicles in DFSP, suggesting a reactive component in this instance.
