posterior junction line

pos·te·ri·or junc·tion line

radiographic image of the mediastinal septum between the upper lobes behind the esophagus, above the aortic arch.
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3) Similarly, the posterior junction line is formed by the close apposition of the lungs and pleura posterior to the esophagus and anterior to the spine, coursing vertically from the lung apices to the top of the aortic arch.
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