Rotation
The technologists are usually very careful to x-ray the patient flat against the cassette. If there is rotation of the patient, the mediastinum may look very unusual. One can access patient rotation by observing the clavicular heads and determining whether they are equal distance from the spinous process of the thoracic vertebral bodies.
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| This is a normal PA film without any rotation. |
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| Magnification of clavicular head and spinous process alignment demonstrating a straight film. |
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