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The tracheoesophageal stripe is formed by the posterior wall of the trachea and the anterior wall of the esophagus. This line is best identified on the lateral chest x-ray. When this line is greater than 5 mm it is considered abnormal.
The most common cause of a thickened tracheoesophageal stripe is esophageal carcinoma, however, lymphadenopathy likely cannot be excluded and further evaluation with additional imaging is recommended.
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