The Posterior Mediastinal Line on Chest Roentgenoqrams

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Abstract
Along with the esophageal-pleural stripe and the anterior mediastinal line, the posterior mediastinal line may be demonstrated on the standard chest roentgenogram, especially when high voltages (120 kv and more) and a fine-line grid of high quality are employed. The posterior mediastinal line, divisible anatomically and radiographically into upper and lower segments, is formed by the pleural surfaces of each lung and intervening mediastinal connective tissue, contrasted bilaterally by the air in each lung. Demonstration of the upper segment is common; of the lower, rare. Morbid states may thicken or displace the upper segment.