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Mononucleosis, or "mono," is a common illness caused by a virus. It's often seen in teens and young adults. It can cause a bad

Mitral valve regurgitation (MR) is the leaking or backflow of blood through the valve between the upper left heart chamber (atrium

A myelogram uses X-rays (fluoroscopy) and a special dye called contrast material to make pictures of bones and nerves of the spine

Glaucoma is a group of eye disorders that damage the nerve at the back of the eye (optic nerve), resulting in loss of eyesight

Nerve conduction studies are tests that measure how well a nerve can send an electrical signal from the spinal cord to the muscles

Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to relieve pain and fever and to reduce swelling and inflammation caused by

A neutrophil is the most common type of white blood cell, the cells that protect the body against infection by destroying bacteria

A neural tube defect (NTD) is a birth defect that occurs when the spine, the brain, or the bone and skin that protect them do not

Spinal nerve roots branch out from each side of the spinal cord and then join to form the spinal nerves, which pass through

Nearsightedness is most often caused by a natural change in the shape of the eyeball that makes the eyeball too long, so that it