Monday, April 19, 2021

Trail's Sign

Shift of trachea produces prominence of sternal head of sternocleidomastoid on the side to which the trachea is shifted. It is called Trail's sign.

The pretracheal fascia encloses the clavicular head of stemomastoids muscle on both sides. When the trachea is shifted to one side, the pretracheal fascia covering the stemomastoid muscle on that side relaxes, producing the clavicular head more prominent on the side of tracheal deviation.

Causes of tracheal shift

Pleural disease - Shift to opposite side
  • Pleural effusion
  • Pneumothorax
Pulmonary disease-Shift to same side
  • Fibrosis and collapse of lung
Note: Goiter - Shift of trachea to opposite side.


  1. Which head is covered by the pretracheal fascia?

  2. Mobile off Kyon Nahin ho raha hai


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