sarcoma /sar·co·ma/ (sahr-ko´mah) pl. sarcomas, sarco´mata any of a group of tumors usually arising from connective tissue, although the term now includes some of epithelial origin; most are malignant.
ameloblastic sarcoma,
sarcoma (särkō´m
),
alveolar soft part sarcoma a well-circumscribed, painless, highly metastatic neoplasm with a distinctive alveolar pattern, usually in the limbs, head, and neck of young adults.
ameloblastic sarcoma see under fibrosarcoma.
botryoid sarcoma , sarcoma botryoi´des an embryonal rhabdomyosarcoma arising in submucosal tissue, usually in the upper vagina, cervix uteri, or neck of urinary bladder in young children and infants, presenting grossly as a polypoid grapelike structure.
clear cell sarcoma of kidney a malignant kidney tumor similar to Wilms' tumor but with poorer prognosis, often metastasizing to bone.
endometrial stromal sarcoma a pale, polypoid, fleshy, malignant tumor of the endometrial stroma.
Ewing's sarcoma a highly malignant, metastatic, primitive small round cell tumor of bone, usually in the diaphyses of long bones, ribs, and flat bones of children and adolescents.
giant cell sarcoma
1. a form of giant cell tumor of bone arising malignant de novo rather than transforming to malignancy.
2. sarcoma characterized by large anaplastic (giant) cells.
hemangioendothelial sarcoma hemangiosarcoma.
immunoblastic sarcoma of B cells large cell immunoblastic lymphoma composed predominantly of B cells.
immunoblastic sarcoma of T cells large cell immunoblastic lymphoma composed predominantly of T cells.
Kaposi sarcoma a multicentric, malignant neoplastic vascular proliferation, characterized by the development of bluish-red nodules on the skin, sometimes with widespread visceral involvement; a particularly virulent, disseminated form occurs in immunocompromised patients.
Kupffer cell sarcoma hepatic angiosarcoma.
osteogenic sarcoma osteosarcoma.
pseudo–Kaposi sarcoma unilateral subacute to chronic dermatitis occurring in association with an underlying arteriovenous fistula and closely resembling Kaposi's sarcoma clinically and histologically.
reticulum cell sarcoma histiocytic lymphoma.
Rous sarcoma a virus-induced sarcoma-like growth of fowls.
soft tissue sarcoma a general term for a malignant tumor derived from extraskeletal connective tissue, including fibrous, fat, smooth muscle, nerve, vascular, histiocytic, and synovial tissue, with almost all lesions arising from primitive mesoderm.
spindle cell sarcoma
1. any sarcoma composed of spindle-shaped cells.
2. a type of soft tissue sarcoma whose cells are spindle-shaped and which is usually resistant to radiation therapy.
| ameloblastic sarcoma n. |
ameloblastic sarcoma,
a malignant odontogenic tumor characterized by the proliferation of epithelial and mesenchymal tissue without the formation of dentin or enamel.
sarcoma (särkō´m
),n 1. a malignant neoplasm of connective tissue elements.
2. a malignant neoplasm arising from mesenchyme or its derivatives.
2. a malignant neoplasm arising from mesenchyme or its derivatives.
sarcoma, ameloblastic,
n a rare mixed tumor of odontogenic origin in which the mesenchymal component has undergone malignant transformation.
sarcoma, Ewing's,
n.pr a rare, neuroectodermal malignancy of bone, caused by a translocation between chromosomes 11 and 22 [t(11, 22)]. It is characterized by pain, a radiographic appearance called
onion skinning, and a histologic picture consisting of solid sheets of small round blue cells.
onion skinning, and a histologic picture consisting of solid sheets of small round blue cells.
sarcoma, Kaposi's,
n.pr a benign neoplasm of endothelial tissues. Skin lesions appear as multiple red-brown nodules ranging from a few mm to 1 cm in size. Histologically, endothelial proliferation in sheets or small vessels, hemosiderin deposits, fibroblastic proliferation, and an inflammatory infiltrate of lymphocytes are seen. Associated with HIV infection.
)
Kaposi's sarcoma.
sarcoma, neurogenic (malignant schwannoma),
n the malignant form of neurilemoma.
sarcoma, osteoblastic (osteogenic sarcoma),
n an osteosarcoma in which atypical bone formation is the most evident histopathologic feature. See also osteosarcoma.
sarcoma, osteogenic,
n a malignant connective tissue tumor that produces bone.
sarcoma, reticulum cell,
n a malignant tumor of reticulum cells. It may occur as a primary neoplasm in soft tissue or bone.
Sarcomastigophora
n.pl one of the four phyla of parasitic protozoa, to which the sarcodina and mastigophora subphyla belong. Capable of causing keratitis.
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