Posterior junction line
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The posterior junction (or junctional) line is formed by the apposition of the pleural surfaces of the posteromedial surfaces of the upper lobes of the lungs, posteriorly to the esophagus but anterior to the thoracic spine (usually T3-T5) 1,2. Unlike the anterior junction line, the posterior junctional line can extend well above the clavicles. It may contain intervening fat within 2.
There are many causes for an abnormal appearance of this line 1,2:
posterior mediastinum masses
hyperinflation or collapse of one lung can cause lateral displacement