Posterior junction line

Last revised by Patrick O'Shea on 01 Apr 2022

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.The posterior junctional line can extend well above the clavicles and may contain intervening fat within 2.

There are many causes for an abnormal appearance of this line 1,2:

  • posterior mediastinum masses
  • retrosternal goiter
  • hyperinflation or collapse of one lung can cause lateral displacement

Radiographic features

Plain radiograph
 

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Cases and figures

  • Figure 1: red line represent posterior junctional line Case 1 - red line represent posterior junctional line
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  • Figure 2: posterior junction line
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