Discussion of Saber-sheath trachea
- Saber-sheath trachea is common and almost always associated with chronic obstructive pulmonary disease.
- It is characterized by a marked decrease in the coronal diameter of the intrathoracic trachea associated with an increase in its sagittal diameter.
 Imaging Findings for Saber-sheath trachea
- Marked decrease in the coronal diameter of the intrathoracic trachea associated with an increase in its sagittal diameter.
- On CT, inward bowing or displacement of the lateral tracheal walls as a result of cartilage weakness is seen.
- CT during forced expiration may show further inward bowing of the tracheal walls (tracheomalacia), which usually have normal thickness.
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 References for Saber-sheath trachea
- Webb, Emily M., Elicker, Brett M., Webb, W. Richard. Using CT to Diagnose Nonneoplastic Tracheal Abnormalities: Appearanceof the Tracheal Wall. Am. J. Roentgenol. 2000 174: 1315-1321.