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  • Typhus, murine

    An acute infectious disease with fever, headache, and rash, all quite similar to, but milder than, epidemic typhus, caused by a related microorganism, Rickettsia typhi (mooseri), transmitted to humans by rat fleas (Xenopsylla cheopis). The animal reservoir includes rats, mice and other rodents. Murine typhus occurs sporadically worldwide but is more prevalent in congested rat-infested […]

  • Nerve conduction study

    Nerve conduction velocity test.

  • An-

    An-: Prefix very much employed in medicine and all of the health sciences, indicating “not, without, or -less.” For example, the prefix “an” figures into these words: anemia (without blood), anophthalmia (no eye), anotia (no ear), anoxia (no oxygen). The “an-” usually becomes “a-” before a consonant as, for example, in alexia (not read), aphagia […]

  • Graft

    Healthy skin, bone, kidney, liver, or other tissue that is taken from one part of the body to replace diseased or injured tissue removed from another part of the body. For example, skin grafts can be used to cover areas of skin that have been burned.

  • Blepharitis

    rosacea and seborrheic dermatitis.

  • Blastoma

    Blastoma: A tumor thought to arise in embryonic tissue. This term is commonly used as part of the name for a tumor, as in glioblastoma and medulloblastoma (types of brain tumors), hepatoblastoma (a liver tumor), nephroblastoma (a Wilms tumor of the kidney), neuroblastoma (a childhood tumor of neural origin), osteoblastoma (a bone tumor), and retinoblastoma […]

  • Laminectomy

    A surgical procedure in which the posterior arch of a vertebra is removed. Laminectomy is done to relieve pressure on the spinal cord or on the nerve roots that emerge from the spinal canal. The procedure may be used to treat a slipped or herniated disc or to treat spinal stenosis.

  • Tachycardia, sinus

    A fast heartbeat (tachycardia) because of rapid firing of the sinoatrial (sinus) node. The sinoatrial (or sinus) node is the natural pacemaker of the heart. It is located in the wall of the right atrium (the right upper chamber of the heart). Normal cardiac impulses start there and are transmitted to the atria and down […]

  • Expectorant

    Expectorant: A medication that helps bring up mucus and other material from the lungs, bronchi, and trachea. An example of an expectorant is guaifenesin, which promotes drainage of mucus from the lungs by thinning the mucus, and also lubricates the irritated respiratory tract.

  • Hysteroscopy

    A procedure to see inside the uterus (the womb) using a viewing scope that is inserted into the vagina up through the cervix into the uterus.