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A sarcoma composed of spindle cells that produce collagenous fibrils.



an immature malignant tumor of connective tissue; a malignant variant of fibroma, fibromyoma (leiomyoma), or fibroadenoma that can occur in any part of the body. It is characterized by invasive and destructive growth but sometimes has distinct contours. In cross section it looks like fish flesh. A fibrosarcoma has a marked capacity to metastasize, chiefly through blood vessels. It can often be distinguished from a fibroma only by histological examination and is treated surgically.

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Fibrosarcomatous (high grade) dermatofibrosarcoma protuberans: clinicopathologic and immunohistochemical study of a series of 41 cases with emphasis on prognostic significance.
Thorough sampling of the resected tumor showed that part of the tumor was malignant with fibrosarcomatous differentiation.
Pathologic examination confirmed the mass to be a fibrosarcomatous overgrowth in a malignant phyllodes tumor.