March 29th, 2007 at 12:38PM
…vessels that carry the blood from the heart to and from the shoulders and arms travel through a narrow space under the clavicle and above the top of the rib cage. The presence of hypertrophied muscles of the shoulder or neck, or in some cases an extra rib, can make this small opening even tighter. This problem, known as thoracic outlet syndrome… — Diagnosis - Muscle-Bound - Lisa Sanders, M.D. - New York Times
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