On standard radiography, the mediastinal structures are packed closely together and on the frontal projection are largely obscured by bony structures. Even with tomography, it may not be possible to determine the origin and nature of lesions seen on the chest radiograph. In addition, some lesions are obscured by neighbouring structures and may not be detectable by any of the standard methods. For these reasons, the diagnosis of mediastinal abnormalities is one of the most rewarding uses for CT.
KeywordsAortic Arch Superior Vena Cava Intravenous Contrast Medium Azygos Vein Innominate Vein
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