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myeloma |
Also found in: Dictionary/thesaurus, Encyclopedia, Hutchinson | 0.12 sec. |
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myeloma /my·elo·ma/ (mi″ĕ-lo´mah) a tumor composed of cells of the type normally found in the bone marrow. giant cell myeloma see under tumor (1). multiple myeloma a disseminated type of plasma cell dyscrasia characterized by multiple bone marrow tumor foci and secretion of an M component, manifested by skeletal destruction, pathologic fractures, bone pain, the presence of anomalous circulating immunoglobulins, Bence Jones proteinuria, and anemia. plasma cell myeloma multiple m. sclerosing myeloma myeloma associated with osteosclerosis, most often manifested by peripheral neuropathy. solitary myeloma a variant of multiple myeloma in which there is a single localized tumor focus.
Myeloma A tumor that originates in bone marrow and usually spreads to more than one bone. Mentioned in: Bone Marrow Aspiration and Biopsy myeloma [mī′əlō′mə] Etymology: Gk, myelos + oma, tumor an osteolytic neoplasm consisting of a profusion of cells typical of the bone marrow that may develop in many sites and cause extensive destruction of the bone. The tumor occurs most frequently in the ribs, vertebrae, pelvic bones, and flat bones of the skull. Intense pain and spontaneous fractures are common. The tumor is radiosensitive, and local lesions are curable. Kinds of myeloma are endothelial myeloma, extramedullary myeloma, giant cell myeloma, multiple myeloma, and osteogenic myeloma. myeloma (mī´ n a neoplasm characterized by cells normally found in the bone marrow. myeloma, multiple, myeloma, plasma cell, n a malignant neoplasm characterized by plasma cells. Solitary lesions may appear as radiolucencies in the bone and are sometimes considered benign, although most authorities believe that even these lesions become multiple and terminate fatally. myeloma, solitary plasma cell, n an incompletely understood monostotic neoplasm of bone that is histologically identical with multiple myeloma. Laboratory findings, positive in multiple myeloma, are usually negative in solitary plasma cell myeloma. Although usually benign, solitary plasma cell myelomas may be malignant. myelomeningocele (mī´ n a condition in which part of the spinal cord protrudes from between the bones of the vertebrae. The condition can result in paralysis. myeloma 1. a B lymphocyte tumor. 2. multiple myeloma. giant cell myeloma giant cell tumor (1). multiple myeloma a malignant neoplasm of plasma cells, in which the plasma cells proliferate and invade the bone marrow, causing destruction of the bone and resulting in pathological fracture and bone pain. A secretory form of the disease is characterized by the presence of an immunoglobulin recognized as Bence Jones protein (monoclonal immunoglobulin), Bence Jones proteinuria, anemia, and lowered resistance to infection. It is the most common type of monoclonal gammopathy. A non-secretory form of the disease also occurs. osteosclerotic myeloma multiple myeloma associated with osteosclerosis (rather than bone destruction) and often with peripheral neuropathy. plasma cell myeloma see multiple myeloma (above). myeloma protein the immunoglobulin molecules produced by myeloma cells. See gammopathy. myeloma Malignant plasmacytoma, multiple myeloma, multiple plasmacytoma of bone, myelomatosis, plasma cell myeloma Hematology A neoplastic proliferation of plasma cells in BM and extramedullary sites; if circumscribed, plasmacytoma
Epidemiology MM comprises 10% of hematopoietic malignancies, causing 10,000 deaths/yr–US; ↑ with age; black:white 2:1 Clinical As the myeloma cells proliferate in BM, they cause osteolysis, resulting in pathologic fractures and industrial
strength pain, anorexia, nausea, thirst, fatigue, muscle weakness, restlessness, confusion; BM replacement by neoplastic plasma cells results in ↑ infections and anemia due to displacement of normal WBCs, and erythroid series; excess Igs in
circulation plug up renal tubules Lab Monoclonal Igs, often light chains, in serum, urine; ↑ Ca2+; normal PO4, normal alk phos Complications Painful pathologic fractures, anemia, hypercalcemia, renal failure, recurrent bacterial
infections Treatment 1º chemotherapy: Melphalan and prednisone; VAD–vincristine, Adriamycin, dexamethasone in new cases; IFN-α has been used for maintenance; myeloablative therapy, allogeneic BMT from HLA-matched siblings. See Clear
cell, myeloma, Indolent myeloma, Myeloma kidney, Solitary myeloma. Patient discussion about myelomatoid. Q. Multiple Myeloma what and how is it treated and what is MGUF A. Were you referring by any chance to MGUS (monoclonal gammopathy of unknown significance)? It's a condition that resembles myeloma but is much more widespread and by itself isn't considered malignant. It may, however, deteriorate to multiple myeloma over the years. Read more or ask a question about myelomatoidMyeloma is treated with chemotherapy of various kinds, and sometimes with bone marrow transplantation with the patients own bone marrow. You may read more here: www.nlm.nih.gov/medlineplus/multiplemyeloma.html How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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