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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.
posterior: thoracic vertebral bodies
inferior: aortic arch
superior: thoracic inlet
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, as both Radiology and AJR rejected the manuscript. Ben Felson called it Raider's triangle in his Caldwell Lecture in 1986 3.