Retrotracheal space

Dr Daniel J Bell and Dr Henry Knipe et al.

The retrotracheal space (or Raider triangle) is a radiolucent mediastinal space best seen on lateral chest x-rays. It is normally triangular in shape but can vary greatly in size and shape depending on the patient's body habitus and lung volume 1.


History and etymology

The retrotracheal space was first described by Louis Raider (1913-1999) 2 in 1973 4, although he had a hard time finding a journal willing to accept it, both Radiology and AJR rejected the manuscript. Ben Felson called it Raider's triangle in his Caldwell Lecture in 1986 3


Article information

rID: 23539
System: Chest
Section: Approach
Synonyms or Alternate Spellings:
  • Raider triangle
  • Retro-tracheal space
  • Raider's triangle

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