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narcissistic personality disorder - persons with this disorder present severely overly-inflated feelings of self-worth, grandiosity, and superiority over others. Persons with narcissistic personality disorder often exploit others who fail to admire them, and are overly sensitive to criticism, judgment, and defeat.

nasal - relating to the nose.

National Cancer Institute - The US Government agency for cancer research and information.

nausea - a feeling or sensation leading to the urge to vomit.

near point of accommodation - the closest point in front of the eyes that an object may be clearly focused.

near point of convergence - the maximum extent the two eyes can be turned inward.

necrosis - pertaining to the death of tissue.

needle aspiration (of the breast) - a procedure that uses a thin needle and syringe to collect tissue or drain a lump after using a local anesthetic.

needle biopsy - use of a needle to extract tissue, cells, or fluid for microscopic examination.

neoadjuvant therapy - treatment such as chemotherapy, radiation therapy, or hormone therapy which is given before the primary treatment.

neoplasm - any abnormal growth of new tissue; a proliferation of cells no longer under normal physiologic control. These may be benign (non-cancerous) or malignant (cancerous).

nephrectomy - surgical removal of the kidney.

nephritis - inflammation of the kidneys.

nephrology - the medical specialty concerned with diseases of the kidneys.

nephropathy - diabetic kidney disease.

nephrotic syndrome - a condition characterized by high levels of protein in the urine, low levels of protein in the blood, tissue swelling, and high cholesterol.

nerve conduction tests - procedure to determine nerve impulse generation.

nerve sparing technique - a surgical technique during a radial prostatectomy in which one or both of the neurovascular bundles controlling erections are spared.

neural plasticity - ability of the brain and/or certain parts of the nervous system to change in order to adapt to new conditions, such as an injury.

neural prostheses - devices that substitute for an injured or diseased part of the nervous system to enhance the function.

neural stimulation - to activate or energize a nerve through an external source.

neural tube defect - type of birth defect, such as spina bifida, that results from failure of the spinal cord or brain to develop normally in a fetus.

neuralgia - pain in distribution of nerve or nerves.

neuritis - inflammation of a nerve or nerves.

neurofibromatosis - a group of inherited disorders in which non-cancerous tumors grow along several nerves; can affect the development of other tissues, including bones and skin, possibly leading to developmental abnormalities.

neurogenic - of nerve origin.

neurogenic bladder (Also called neuropathic bladder.) - a bladder disorder that can be caused by a tumor or other condition of the nervous system.

neurogenic communication disorder - inability to exchange information with others because of hearing, speech, and/or language problems caused by impairment of the nervous system.

neurological - pertaining to the nervous system.

neuron - a cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another.

neuropathology - the pathology of the nervous system.

neuropathy - diabetic nerve damage.

neurosonography - a procedure that uses ultra high-frequency sound waves that enable the physician to analyze blood flow in cases of possible stroke.

neurotransmitters - chemical substances that carry impulses from one nerve cell to another; found in the space (synapse) that separates the transmitting neuron's terminal (axon) from the receiving neuron's terminal (dendrite).

nigral - of or referring to the substantia nigra.

nitroglycerin - a medication used to relax or dilate arteries.

nodule (Also called papule.) - a solid, raised bump.

noise-induced hearing loss - hearing loss that is caused either by a one-time or repeated exposure to very loud sound or sounds at various loudness levels over an extended period of time.

non-Hodgkin lymphoma - a type of lymphoma, a cancer in the lymphatic system; causes the cells in the lymphatic system to abnormally reproduce, eventually causing tumors to grow. Non-Hodgkin lymphoma cells can also spread to other organs.

noninvasive procedures - a diagnostic effort or treatment that does not require entering the body or puncturing the skin.

nonsteroidal anti-inflammatory drugs (NSAIDs) - medication that produces fever reducing, analgesic (pain relieving), and anti-inflammatory effects.

nonsyndromic hereditary hearing impairment - hearing loss or deafness that is inherited and is not associated with other inherited clinical characteristics.

nonulcer dyspepsia - constant pain or discomfort in the upper gastrointestinal (GI) tract.

norepinephrine - a neurotransmitter found mainly in areas of the brain that are involved in governing autonomic nervous system activity, especially blood pressure and heart rate.

nuclear medicine - a specialized area of radiology that uses very small amounts of radioactive substances to examine organ function and structure.

Nutcracker syndrome - Abnormal muscle tightening in the esophagus.

nutrients - proteins, carbohydrates, fats, vitamins, and minerals provided by food and necessary for growth and the maintenance of life.

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