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Answer to Illuminations
  1. Helen Williams
  1. Correspondence to Dr Helen Williams, Radiology Department, Birmingham Children's Hospital, Steelhouse Lane, Birmingham B4 6NH, UK; helen.williams{at}

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From the questions on page 213.

Answer to Question 1

The correct answer is A: complete (right) lung collapse. There is non-aeration of the right lung and the right hemithorax is completely opacified. The collapsed lung is reduced in volume so the trachea and other mediastinal contents are deviated to the …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; internally peer reviewed.