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Cervical rib. MDCT (A - three-dimensional reconstruction; B - axial maximum intensity projection) showing a supernumerary rib on the right (arrows), articulating posteriorly with the C7 vertebral body, with no articular structure in its aspect anterior to the sternum or any bony structure (floating ). Note its close relationship with the first thoracic rib and the ipsilateral clavicle, which can be related, in some cases, to vascular compression syndrome.
