Ewing sarcoma


Ew·ing tu·mor

(yū'ing), a malignant neoplasm which occurs usually before the age of 20 years, about twice as frequently in males, and in about 75% of patients involves bones of the extremities, including the shoulder girdle, with a predilection for the metaphysis; histologically, there are conspicuous foci of necrosis in association with irregular masses of small, regular, rounded, or ovoid cells (2-3 times the diameter of erythrocytes), with very scanty cytoplasm. Synonym(s): endothelial myeloma, Ewing sarcoma

Ewing sarcoma

Primitive neuroectodermal tumor, PNET Oncology A primitive neuroectodermal tumor, which primarily affects the midshaft of long bones, which is closely related–if not biologically identical to peripheral neuroepitheliomas Clinical Locoregional bone pain, or pathologic fractures Treatment Excision, RT; few respond to chemotherapy. See Peripheral neuroepithelioma.

Ew·ing tu·mor

(yū'ing tū'mŏr) A malignant neoplasm that occurs usually before the age of 20 years, about twice as frequently in males, and in about 75% of patients involves bones of the extremities, including the shoulder girdle, with a predilection for the metaphysis; histologically, there are conspicuous foci of necrosis in association with irregular masses of small, regular, rounded, or ovoid cells (2-3 times the diameter of erythrocytes), with very scanty cytoplasm.
Synonym(s): endothelial myeloma, Ewing sarcoma.

Ewing,

James, U.S. pathologist, 1866-1943. Ewing sarcoma - Synonym(s): Ewing tumorEwing tumor - a malignant neoplasm that involves bones of the extremities, including the shoulder girdle, with a predilection for the metaphysis. Synonym(s): endothelial myeloma; Ewing sarcoma