Anterior junction line
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The anterior junction (or junctional) line is a feature of frontal chest radiographs and chest CTs. It is a result of the parietal and visceral pleura meeting anteromedially. It normally contains a small amount of fat in between but can form a stripe of variable thickness if there is a lot of fat present or by the presence of the thymus in young patients 1.
Anterior mediastinal masses can cause obliteration of the anterior junction line 3.
- seen on ~40% (range 25-57%) of frontal chest x-rays 1
- oblique course crossing the upper two-thirds of the sternum from the upper right to lower left 1,2 and does not extend above the manubriosternal joint 3
- seen as a thin, dense line separating the two lungs in the anterosuperior portion of the chest 2