Tracheoesophageal Stripe 

The posterior wall of the trachea (T) and the anterior wall of the esophagus (E) are in close contact and form the tracheoesophageal stripe in the lateral view (arrow). 

It is considered abnormal when it is wider than __ mm.

Common causes for thickening of tracheoesophageal stripe are:
  • Esophageal disease 
  • Nodal enlargement