mesenchymoma


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mesenchymoma

 [mes″eng-ki-mo´mah]
a mixed mesenchymal tumor composed of two or more cellular elements that are not commonly associated, exclusive of fibrous tissue.

mes·en·chy·mo·ma

(mes'eng-kī-mō'mă),
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, for example, 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).

mesenchymoma

A tumor that contain 2 or more mesenchymal elements in addition to fibroblasts; the term has specific significance in each affected organ Cartilage Vascular hamartoma, cartilaginous hamartoma A benign chest wall tumor of infancy Liver Hepatic mesenchymoma is a large, aggressive embryonal or 'primitive' sarcoma of the pediatric liver with a median survival of < 1 yr, characterized by necrosis, hemorrhage, cystic degeneration, atypical fibroblasts, and exuberant mitotic activity, entrapping hyperplastic bile duct-like structures Muscle Ecto-mesenchymoma An embryonal rhabdomyosarcoma with ganglionic differentiation. See Triton tumor.

mes·en·chy·mo·ma

(mes'eng-kī-mō'mă)
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. A malignant mesenchymoma may also occur as a similar mixture of two or more types of mesenchymal cells that are malignant.
References in periodicals archive ?
Final diagnosis on the basis of histopathologic and immunohistochemical results was a malignant mesenchymoma with differentiation into striated muscle cells, osteoblasts, and adipocytes in the pectoral muscle with metastasis to the adrenal gland.
This report describes the diagnosis of a malignant mesenchymoma with metastasis to 1 adrenal gland in a northern saw-whet owl.
Malignant mesenchymoma is an extremely rare malignant soft tissue tumor composed of two or more different mesenchymal tissue elements (sarcomas) that can occur in any location in the body.
Kumta, "Primary osteochondrorhabdomyosarcoma (malignant mesenchymoma) of the fibula: a rare tumour in an unusual site--case report and review of the literature," APMIS, vol.
[9] In 1973 Stanley classified it as a malignant mesenchymoma because of the presence of focal chondroid-appearing cells.
Primary malignant mesenchymal tumors (mesenchymoma) of the liver in childhood: an angiographic-pathologic study of three cases.
Soft-tissue sarcomas are tumors arising from extraskeletal connective tissues and from Schwann cells and include fibrosarcoma, liposarcoma, hemangiopericytoma, rhabdomyosarcoma, lymphangiosarcoma, malignant fibrous histiocytoma, leiomyosarcoma, myxosarcoma, myxofibrosarcoma, mesenchymoma, spindle cell tumors, and malignant peripheral nerve sheath tumors (neurofibrosarcoma, Schwannoma).
Pathogenesis of FML is uncertain; some authors suggest that it is a hamartoma or mesenchymoma. [13] FML is usually transmitted in an autosomal-dominant fashion as reported by Gologorsky et al.
It was originally described as a mesenchymoma, but because it is nonneoplastic, the term hamartoma is more appropriate.
These cases were designated "chondroid hamartoma," "nasal hamartoma," and "mesenchymoma," respectively.[3,12,13] Along with our 2 patients, altogether we identified 13 cases documented in children, as summarized in the Table.
The malignant tumors are divided into rhabdomyosarcoma, mesenchymomas, neurosarcoma, fusiform cell tumors, malignant heart hemangioma, and lymphosarcoma.
[10] Tumors that less commonly contain myxoid stroma include desmoid tumors, hemangiopericytomas, leiomyomas, leiomyosarcomas, malignant pericytomas, rhabdomyosarcomas, and malignant mesenchymomas. [10] (5) Necrotic portions within tumors have low attenuation without contrast enhancement at CT.