Study Status: Completed
Recruit Status: Completed
Study Type: Observational
Official Title: Thoracic Outlet Syndrome: Case Reports and Analysis - Ultrasound Imaging and Pathomechanics of Brachial Plexus Compression
Brief Summary: Thoracic outlet syndrome is caused by compression of the brachial plexus, in most cases under the pectoralis minor muscle in the infraclavicular region of the shoulder. The hypothesis is that ultrasound imaging can be used to visualize brachial plexus compression and distortion of the pectoralis muscle during arm activity, such as abduction, and that normal subjects will not demonstrate any plexus compression or muscle distortion.