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Related Experiment Videos

The left paratracheal reflection.

A V Proto1, H L Corcoran, J B Ball

  • 1Department of Radiology, Medical College of Virginia Hospitals, Richmond 23298.

Radiology
|June 1, 1989
PubMed
Summary
This summary is machine-generated.

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The left paratracheal reflection, a finding on chest X-rays, is often caused by lung contact with mediastinal fat. Advanced imaging like CT scans clarifies its anatomical basis.

Area of Science:

  • Radiology
  • Thoracic Imaging
  • Anatomy

Background:

  • The left paratracheal reflection is an anatomical landmark on chest radiographs.
  • Its precise nature and common causes are not always well understood.

Purpose of the Study:

  • To investigate the anatomical basis of the left paratracheal reflection.
  • To determine the frequency of its visibility on different imaging modalities.

Main Methods:

  • Analysis of 302 normal posteroanterior (PA) chest radiographs.
  • Review of 93 conventional chest tomograms.
  • Examination of 113 thoracic computed tomographic (CT) scans.

Main Results:

  • The left paratracheal reflection was visible in 31% of normal PA chest radiographs.

Related Experiment Videos

  • Conventional tomography and CT revealed it results from lung-mediastinum contact anterior to the left subclavian artery.
  • CT scans showed it represents lung contact with mediastinal fat (94%), left common carotid artery (5%), or left tracheal wall (1%).

    • Conclusions:

    • The left paratracheal reflection is primarily formed by the lung's contact with mediastinal fat.
    • Understanding the anatomical structures contributing to this finding is crucial for accurate interpretation of thoracic imaging.