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glossary

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  • Jaundice

    (JAWN-dis)

    A condition in which the skin and the whites of the eyes become yellow, urine darkens, and the color of stool becomes lighter than normal. Jaundice occurs when the liver is not working properly or when a bile duct is blocked.

  • Joints

    (joynts)

    In medicine, the place where two or more bones are connected. Examples include the shoulder, elbow, knee, and jaw.

  • Juvenile myelomonocytic leukemia

    JOO-veh-NILE MY-eh-loh-MAH-noh-SIH-tik loo-KEE-mee-uh

    A rare form of childhood leukemia in which cancer cells often spread into tissues such as the skin, lung, and intestines. Also called JMML.

  • Kidney

    (KID-nee)

    One of a pair of organs in the abdomen. The kidneys remove waste and extra water from the blood (as urine) and help keep chemicals (such as sodium, potassium, and calcium) balanced in the body. The kidneys also make hormones that help control blood pressure and stimulate bone marrow to make red blood cells.

  • Kidney cancer

    (KID-nee KAN-ser)

    Cancer that forms in tissues of the kidneys. The most common type of kidney cancer in adults is renal cell carcinoma. It forms in the lining of very small tubes in the kidney that filter the blood and remove waste products. Transitional cell cancer of the renal pelvis is kidney cancer that forms in the center of the kidney where urine collects. Wilms tumor is a type of kidney cancer that usually develops in children under the age of 5.

  • Klinefelter syndrome

    (KLINE-fel-ter SIN-drome)

    A genetic disorder in males caused by having one or more extra X chromosomes. Males with this disorder may have larger than normal breasts, a lack of facial and body hair, a rounded body type, and small testicles. They may learn to speak much later than other children and may have difficulty learning to read and write. Klinefelter syndrome increases the risk of developing extragonadal germ cell tumors and breast cancer.

  • Laboratory study

    (LA-bruh-tor-ee STUH-dee)

    Research done in a laboratory. A laboratory study may use special equipment and cells or animals to find out if a drug, procedure, or treatment is likely to be useful in humans. It may also be a part of a clinical trial, such as when blood or other samples are collected. These may be used to measure the effect of a drug, procedure, or treatment on the body.

  • Lactate dehydrogenase

    (LAK-tayt dee-hy-DRAH-jeh-nays)

    One of a group of enzymes found in the blood and other body tissues and involved in energy production in cells. An increased amount of lactate dehydrogenase in the blood may be a sign of tissue damage and some types of cancer or other diseases. Also called lactic acid dehydrogenase and LDH.

  • Laser

    (LAY-zer)

    A device that forms light into intense, narrow beams that may be used to cut or destroy tissue, such as cancer tissue. It may also be used to reduce lymphedema (swelling caused by a buildup of lymph fluid in tissue) after breast cancer surgery. Lasers are used in microsurgery, photodynamic therapy, and many other procedures to diagnose and treat disease.

  • Laser surgery

    (LAY-zer SER-juh-ree)

    Treatment that uses intense, narrow beams of light to cut and destroy tissue, such as cancer tissue. Laser therapy may also be used to reduce lymphedema (swelling caused by a buildup of lymph fluid in tissue) after breast cancer surgery.