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Fibrosarcoma

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Comments:
High-grade fibrosarcoma showing more pleomorphic nuclei, frequent mitoses, and less collagen. Fibrosarcomas are vimentin pos, keratin neg (helpful for distinction from monophasic synovial sarcoma), S-100 neg (distinction from desmoplastic melanoma). SMA and/or MSA may be focally positive due to myofibroblastic differentiation. Radical excision reduces recurrence risk and improves survival rates.

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