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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Radical prostatectomy Radical prostatectomy
    Radical prostatectomy: A surgery procedure that removes the entire prostate gland plus some surrounding tissue. During the procedure the pelvic lymph nodes may also be sampled for a biopsy. The goal is to remove the cancer entirely and prevent its spread to other parts of the body....
  2. Radiculopathy Radiculopathy
    Radiculopathy: Any disease of the spinal nerve roots and spinal nerves. It is synonymous with radiculitis. Radiculopathy is characterized by pain which seems to radiate from the spine to extend outward to cause symptoms away from the source of the spinal nerve root irritation.Causes of radiculopa...
  3. Radiculopathy, lumbar Radiculopathy, lumbar
    Radiculopathy, lumbar: See Lumbar radiculopathy....
  4. Radio frequency identification Radio frequency identification
    Radio frequency identification: (RFID) A system for remotely storing and retrieving data. An RFID tag may be a little sticker that can be attached to an object. The tag contains an antenna that enables it to receive and respond to a radiofrequency query from an RFID device called a transceiver. Most...
  5. Radioactive Radioactive
    Radioactive: Emitting energy waves due to decaying atomic nuclei. Radioactive substances are used in medicine as tracers for diagnosis, and in treatment to kill cancerous cells....
  6. Radioactive iodine Radioactive iodine
    Radioactive iodine: An isotope of the chemical element iodine that is radioactive. Radioactive iodine is used in diagnostic tests as well as in radiotherapy of an hyperactive thyroid gland (hyperthyroidism), most often due to Graves' disease. For hyperthyroidism, Radioactive iodine is administe...
  7. Radioactive tracer Radioactive tracer
    Radioactive tracer: A radioactive molecule that can be sent through the body's circulatory or urinary system, with its progress followed by a radiation-sensitive machine....
  8. Radioallergosorbent test Radioallergosorbent test
    Radioallergosorbent test: An allergy test done on a sample of blood. The test is used to check for allergic sensitivity to specific substances. In the test, the sample of blood is mixed with substances known to trigger allergies. The test measures the level of allergy antibodies (specific IgE anti...
  9. Radiofrequency ablation Radiofrequency ablation
    Radiofrequency ablation: The use of electrodes to generate heat and destroy abnormal tissue. In radiofrequency ablation (RFA), heat is generated locally by a high frequency, alternating current that flows from the electrodes. A probe is inserted into the center of the tumor and the non-insulated el...
  10. Radiograph Radiograph
    Radiograph: A film with an image of body tissues that was produced when the body was placed adjacent to the film while radiating with X-rays....
  11. Radiography Radiography
    Radiography: Film records (radiographs) of internal structures of the body. Radiography is made possible by X-rays (or gamma rays) passing through the body to act on a specially sensitized film....
  12. Radioimmunoassay Radioimmunoassay
    Radioimmunoassay: A very sensitive, specific laboratory test (assay) using radiolabeled (and unlabeled) substances in an immunological (antibody-antigen) reaction....
  13. Radioinsensitive Radioinsensitive
    Radioinsensitive: Not sensitive to X-rays and other forms of radiant energy. For example, a tumor may be radioinsensitive, and therefore cannot be successfully attacked using radiation therapy. The opposite of radiosensitive....
  14. Radioiodine Radioiodine
    Radioiodine: An isotope of the chemical element iodine that is radioactive. Radioiodine is used in diagnostic tests as well as in radiotherapy of an hyperactive thyroid gland (hyperthyroidism), most often due to Graves' disease. For hyperthyroidism, radioiodine is administered in capsule form o...
  15. Radioisotope Radioisotope
    Radioisotope: A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form. Radioisotopes have important uses in medical diagnosis, treatment, and research. A radioisotope is so-named because it is a radioactive isotope, an isotope being an alter...