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Ultrasonography (Ultrasound): A technique that permits computer generated images from reflected sound waves. A very useful method to examine body organs for size and for other characteristics, such as metastatic tumor replacement of liver, kidney or gallbladder stones, and details of heart structure.
Virus: A minute microbe made of DNA or RNA, too small to be seen with a light microscope, which depends on the cell it infects for its replication and survival.
White Cells: A synonym for leukocytes. There are five major types of white cells in the blood: neutrophils, eosinophils, basophils, monocytes and lymphocytes.
X-ray: A type of high-energy radiation. In low doses, x-rays are used to diagnose diseases by making pictures of the inside of the body. In high doses, x-rays are used to treat cancer.
X-ray Therapy: The use of high-energy radiation from x-rays to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (external-beam radiation therapy) or from materials called radioisotopes. Radioisotopes produce radiation and can be placed in or near the tumor or in the area near cancer cells. This type of radiation treatment is called internal radiation therapy, implant radiation, interstitial radiation, or brachytherapy. Systemic radiation therapy uses a radioactive substance, such as a radiolabeled monoclonal antibody, that circulates throughout the body. X-ray therapy is also called radiation therapy, radiotherapy, and irradiation.
Xenograft: The cells of one species transplanted to another species.
Zevalin (Ibritumomab Tiuxetan): Is a regimen that is indicated for treatment of relapsed or refractory, low-grade, follicular or transformed NHL, including patients with RITUXAN-reftractory follicular disease.