Thoracic Outlet Syndrome:

Mid-plexus Fibrotic Entrapment After First Rib Resection
Mid plexus fibrosis after first rib resection. The elements of the brachial plexus both proximal and distal to the area of fibrosis demonstrate normal separation between the nerve elements. At the area indicated by the two arrows, the elements are adherent to each other, and demonstrate some deviation from their normal course. An additional image in the plane of the plexus elements also demonstrated a posterior deviation at this point. Palpation of the plexus at this location confirmed a Tinel's sign and focal tenderness in the area suggested by this image.
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