Scheuermann's disease as a model displaying the mechanism of venous obstruction in thoracic outlet syndrome and migraine patients: MRI and MRA.

Kyphosis of the thoracic spine rotates the scapulae anterior laterally, clavicles and subclavius muscles anteriorly, displaces the manubrium posteriorly, which increases the slope of the first ribs. This increases tension on the anterior scalene muscles and the neurovascular bundles which causes brachial plexopathy (TOS). Scheuermann's disease (spinal osteochondrosis; juvenile kyphoscoliosis) is a disorder which consists of vertebral wedging endplate irregularity and narrowing of the intervertebral disk space causing kyphosis of the thoracic spine and may also involve the lumbar space.