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Dermatofibrosarcoma protuberans with fibrosarcomatous transformation: a case report.
Ceskoslovenska Patologie
|June 5, 2020
Summary
Dermatofibrosarcoma protuberans (DFSP) can transform into fibrosarcoma, potentially leading to metastasis. Early identification of this transformation is crucial for effective treatment and improved patient prognosis.
Area of Science:
- Oncology
- Dermatopathology
- Surgical Pathology
Background:
- Dermatofibrosasrcma protuberans (DFSP) is a rare, locally aggressive skin tumor.
- DFSP rarely metastasizes, with complete excision offering an excellent prognosis.
- Approximately 10% of DFSP cases undergo fibrosarcomatous transformation, associated with metastasis and a worse prognosis.
Observation:
- A case report details a male patient presenting with a subcutaneous tumor on his back.
- An initial small biopsy was misdiagnosed as a spindle cell sarcoma.
- Histopathological examination of the entire resected tumor revealed dermatofibrosarcoma protuberans with a fibrosarcomatous component.
Findings:
- Both the DFSP and the fibrosarcomatous components within the tumor exhibited the characteristic COL1A1-PDGFB gene fusion.
- The presence of a fibrosarcomatous component significantly impacts the prognosis of DFSP.
- Distinguishing fibrosarcoma arising within DFSP from de novo fibrosarcoma has therapeutic implications.
Implications:
- Accurate histopathological assessment of the entire tumor is vital for correct diagnosis and prognostic evaluation of DFSP.
- Patients with metastatic or inoperable DFSP exhibiting fibrosarcomatous transformation may benefit from targeted therapy with imatinib.
- This case highlights the importance of comprehensive examination in managing aggressive soft tissue tumors.
