63 NCCN Guidelines for Patients ® : Multiple Myeloma, 2018 Dictionary bone densitometry A test that uses x-rays to make pictures that show how strong or thin bones are. bone lesion An area of bone damage or abnormal tissue in the bone. bone marrow The soft, sponge-like tissue in the center of most bones where blood cells are made. bone marrow aspiration The removal of a small amount of liquid bone marrow (soft tissue in the center of bones where blood cells are made) to test for disease. bone marrow biopsy The removal of a small amount of solid bone and bone marrow (soft tissue in the center of bones where blood cells are made) to test for disease. bone survey A set of x-rays of the entire skeleton to look for broken or damaged bones. Also called skeletal survey. calcium A mineral needed for healthy teeth, bones, and other body tissues. chemotherapy Drugs that kill fast-growing cells throughout the body, including normal cells and cancer cells. chromosomes Long strands that contain bundles of coded instructions in cells for making and controlling cells. clinical trial Research on a test or treatment to assess its safety or how well it works. clone An exact copy. complete blood count (CBC) A test of the number of blood cells. compression fracture A break (fracture) in a bone caused by the collapse of bones in the spine. computed tomography (CT) scan A test that uses x-rays from many angles to make a picture of the inside of the body. contrast A dye put into your body to make clearer pictures during imaging tests. core needle biopsy Use of a wide, hollow needle to remove a large sample of tissue from the body to test for cancer cells. creatinine A waste product of muscles that is filtered out of blood into urine by the kidneys. cycle Days of treatment followed by days of rest. diagnose To confirm or identify a disease or health condition. differential A test of the number of blood cells, including the different types of white blood cells (neutrophils, lymphocytes, monocytes, basophils, and eosinophils). The amount of hemoglobin (substance in the blood that carries oxygen) and the hematocrit (the amount of whole blood that is made up of red blood cells) are also measured. donor A person who gives blood, cells, tissue, or an organ to another person. donor lymphocyte infusion Treatment in which the patient receives white blood cells called lymphocytes from the same donor used for the allogeneic stem cell transplant. electrolytes Minerals in blood that carry an electric charge and control some body functions. erythropoietin A drug used to treat patients with low red blood cell counts. external beam radiation therapy (EBRT) Radiation therapy (use of high-energy rays to destroy cancer cells) received from a machine outside the body. extraosseous Occurring outside the bone.