Backset: The distance between the back of the head and the front of the head restraint in a vehicle.

Bells Palsy: An affliction of the nerves of the face that can cause excruciating, piercing pain with accompanying muscles spasms and facial contortions. Although the etiology is unknown, trauma often initiates the dysfunction. Bells palsy is considered to be self limiting, and most cases will fade with time; electrotherapies can help speed recovery.

Birth Defect: A birth defect is a problem that happens while the baby is developing in the mother’s body. Most birth defects happen during the first 3 months of pregnancy. Birth defects may affect how the body looks, works, or both. It can be found before birth, at birth, or anytime after birth. Most defects are found within the first year of life. Some birth defects (such as cleft lip or clubfoot) are easy to see, but others (such as heart defects or hearing loss) are found using special tests (such as x-rays, CAT scans, or hearing tests). Birth defects can vary from mild to severe. Some birth defects can cause the baby to die. Babies with birth defects may need surgery or other medical treatments, but, if they receive the help they need, these babies often lead full lives.

Bone Densitometry: Bone density scanning, also called dual-energy x-ray absorptiometry (DXA or DEXA) or bone densitometry, is an enhanced form of x-ray technology that is used to measure bone loss. DEXA is today's established standard for measuring bone loss or bone mineral density (BMD). http://www.idifwb.com/services/exam%20descriptions/bonedensity.htm

Bone Spur: An area of calcium deposition in response to injury, disease, incorrect motion or position of a joint. Osteoarthritis often results in bone spurs.

Bruit: (bru-we) Abnormal and often harsh sound heard over a blood vessel, usually an artery, with a stethoscope. It is synchronous with your heartbeat. The sound is caused by turbulent blood flow, due to irregularities in the wall of the blood vessel or an abnormal connection (fistula) between an artery and vein. It is often a sign of an underlying problem — sometimes serious. For example, a bruit heard over the thyroid may be due to excess blood flow caused by Graves' disease. Heard over the carotid or abdominal artery, a bruit may indicate fatty buildup (atherosclerosis).