Sabre-sheath trachea
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Saber-sheath trachea refers to diffuse coronal narrowing of the intra-thoracicintrathoracic portion of the trachea with the concomitant widening of the sagittal diameter. It is not uncommon and is pathognomonic for chronic obstructive pulmonary disease (COPD) 1.
The sagittal:coronal diameter is over 2:1 2 and the extra-thoracic portion of the trachea is not narrowed. The supporting tracheal cartilage is usually thickened and densely calcified 4.
Radiographic features
Marked decrease in the coronal diameter of the intra-thoracicintrathoracic trachea associated with an increase in its sagittal diameter.
CT
Additional features may include:
- inward bowing or displacement of the lateral tracheal walls as a result of cartilage weakness
- mild
intra-thoracicintrathoracic tracheal wall thickening - ossification of tracheal rings
- during forceful expiration, there may be further inward bowing
-<p><strong>Saber-sheath trachea </strong>refers to diffuse coronal narrowing of the intra-thoracic portion of the trachea with concomitant widening of the sagittal diameter. It is not uncommon and is pathognomonic for <a href="/articles/chronic-obstructive-pulmonary-disease-1">chronic obstructive pulmonary disease (COPD) </a><sup>1</sup>. </p><p>The sagittal:coronal diameter is over 2:1 <sup>2</sup> and the extra-thoracic portion of the trachea is not narrowed. The supporting tracheal cartilage is usually thickened and densely calcified <sup>4</sup>.</p><h4>Radiographic features</h4><p>Marked decrease in the coronal diameter of the intra-thoracic trachea associated with an increase in its sagittal diameter.</p><h5>CT</h5><p>Additional features may include:</p><ul>- +<p><strong>Saber-sheath trachea </strong>refers to diffuse coronal narrowing of the intrathoracic portion of the trachea with the concomitant widening of the sagittal diameter. It is not uncommon and is pathognomonic for <a href="/articles/chronic-obstructive-pulmonary-disease-1">chronic obstructive pulmonary disease (COPD) </a><sup>1</sup>. </p><p>The sagittal:coronal diameter is over 2:1 <sup>2</sup> and the extra-thoracic portion of the trachea is not narrowed. The supporting tracheal cartilage is usually thickened and densely calcified <sup>4</sup>.</p><h4>Radiographic features</h4><p>Marked decrease in the coronal diameter of the intrathoracic trachea associated with an increase in its sagittal diameter.</p><h5>CT</h5><p>Additional features may include:</p><ul>
-<li>mild intra-thoracic tracheal wall thickening</li>- +<li>mild intrathoracic tracheal wall thickening</li>
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