66 NCCN Guidelines for Patients ® : Multiple Myeloma, 2019 Words to know MRI magnetic resonance imaging multiple myeloma A cancer of plasma cells—white blood cells that make germ- fighting proteins—that has spread throughout the bone marrow. myeloma cell / myeloma cancer cell An abnormal plasma cell that makes too many copies of itself and that grows and divides all the time. NSAID nonsteroidal anti-inflammatory drug observation A period of testing without treatment or right after treatment to check for cancer growth. oligosecretory myeloma Myeloma that makes very few or no M-proteins. Also called nonsecretory myeloma. orthopedic surgeon A surgeon who’s an expert in operations of the bones. osseous Occurring inside the bone. osteonecrosis The death of bone cells. pathologist A doctor who’s an expert in testing cells and tissue to find disease. PET positron emission tomography PET/CT positron emission tomography/computed tomography physical exam A review of the body by a health expert for signs of disease. plasma The yellowish liquid part of blood that carries blood cells. plasma cell A type of white blood cell that makes germ-fighting proteins. plasma cell proliferation A test that shows how many myeloma cells are dividing. plasmacytoma A mass formed by abnormal plasma cells (myeloma cells). plasmapheresis A process that removes excess proteins, such as M-proteins, from the blood. platelet A type of blood cell that forms blood clots to control bleeding. pneumonia A severe inflammation of the lungs. positron emission tomography/computed tomography (PET/CT) scan A test that uses radioactive material and x-rays to see the shape and function of organs and tissues inside the body. positron emission tomography (PET) scan A test that uses radioactive material to see the shape and function of organs and tissues inside the body. primary treatment The main treatment used to rid the body of cancer. prognosis The likely or expected course and outcome of a disease. progression The course of disease as it gets worse or spreads in the body. progressive disease Cancer that is growing, spreading, or getting worse. protein A chain of small chemical compounds important to every cell. radiation therapy The use of high-energy rays (radiation) to destroy cancer cells. red blood cell A type of blood cell that carries oxygen from the lungs to the rest of the body.