Chest x-ray lines and stripes
Chest x-ray lines and stripes are important to recognize on chest radiographs.
Lines are usually less than 1 mm in width and are comprised of tissue outlined on either side by air and typically represent pleural-covered structures within the middle and superior mediastinum :
Stripes, on the other hand, are thicker than lines, and are seen when these thicker anatomical structures are outlined by air
- right paratracheal stripe
- left paratracheal stripe
- posterior tracheal stripe / tracheo-esophageal stripe
- posterior wall of bronchus intermedius
A third important part of chest x-ray lines and stripes are the interfaces, although confusingly some are known as 'lines/stripes', which are the borders of solid structures with air :
- right paraspinal line
- left paraspinal line
- aortopulmonary (aortic-pulmonary) stripe
- aortopulmonary window
- azygo-esophageal recess
Recognition of any abnormality in the various lines and stripes on chest x-ray is invaluable in ensuring the appropriateness in further investigation with CT .
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