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Glossary - J


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  • J tube

    (... toob)

    J stands for jejunostomy , which is surgery to create an opening into the jejunum (part of the small intestine) from the outside of the body. A jejunostomy allows a feeding tube to be put into the small intestine.

  • Jamshidi needle

    (jam-SHEE-dee NEE-dul)

    A long, hollow needle with a tapered cutting edge on one end and a handle with a place to attach a syringe on the other end. It is used to remove a sample of tissue from the bone marrow. The needle is inserted through the bone into the bone marrow and the syringe is attached to the top to remove the sample or to deliver drugs or fluid into the bone. A Jamshidi needle is a type of bone marrow needle.

  • Jaundice


    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


    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.