Definition: Rarely used term for a neoplasm in which there is a mixture of mesenchymal derivatives, other than fibrous tissue. A benign mesenchymoma may contain foci of vascular, muscular, adipose, osteoid, osseous, and cartilaginous tissue; such neoplasms are sometimes classed under a compounded name, angioleiomyolipoma, and the like, but the broader term may be preferred. A malignant mesenchymoma may also occur as a similar mixture of two or more types of mesenchymal cells that are malignant (other than fibrous tissue cells).
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