clavicle. This compression results in intermittent to constant pain in the neck, shoulder, upper arm, forearm, or hand. Thoracic outlet syndrome is seen in about one percent of the population(1). The typical patient is a 35-year-old, slender housewife with well-developed musculature. Persons whose occupations require prolonged abduction with external rotation of the arm, such as typing, window washing, or painting, may be affected.