Sarcoma
One of a group of tumors usually arising from connective tissue. Most sarcomas are malignant. Many types are named after the type of cell, tissue, or structure involved, as in angiosarcoma, chondrosarcoma, fibrosarcoma, liposarcoma,and osteosarcoma.
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- Sarcoma, Ewing
A malignant tumor that arises in a primitive nerve cell within bone or soft tissue and affects children and adolescents, especially between ages 10 and 20. Ewing sarcoma usually appears in the large bones of the arms and legs and the flat bones of the pelvis, spine, and ribs. Treatments include chemotherapy, surgery, and radiation […]
- Sarcoma, Kaposi
A relatively rare type of skin malignancy that tends to afflict elderly people or, especially, those with an abnormal immune system as in AIDS. Kaposi sarcoma is a highly vascular (“angioblastic”) tumor of the skin characterized by soft purplish plaques and papules that form nodules which typically start on the feet and ankles and then […]
- Sarcoma, metastatic
A sarcoma that is spreading into other body tissues through the lymphatic system. The most common site for metastatic sarcoma is the lungs, and there are usually multiple lesions (seen as spots on an X-ray, or as masses on a CT scan). Treatment is by chemotherapy and surgery, but prognosis is poor.
- Sarcoma, synovial
A malignant tumor of soft tissue that arises near, but not in, a joint. Synovial sarcomas most often occur in adolescents or young adults, are typically slow-growing, and may escape notice until they become painful. They occur mainly in the arms and legs, near large joints, especially the knees. Although the tumor is called synovial […]
- SARS vaccine
A vaccine to protect against severe acute respiratory syndrome (SARS). The SARS epidemic surfaced early in 2003 and a crash program was soon begun to develop a vaccine directed against the coronavirus that causes SARS. No licensed vaccine had hitherto been developed for any human coronavirus. Other coronaviruses are among the viruses that cause the […]