Reversed halo sign

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[edit] Discussion of Reversed halo sign

  • The reversed halo sign is defined as central ground-glass opacity surrounded by denser consolidation of crescentic (forming more than three fourths of a circle) or ring (forming a complete circle) shape of at least 2 mm in thickness.
  • The reversed halo sign is a relatively specific sign for cryptogenic organizing pneumonia, although it is only seen in of fifth of patients with the disease.

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Patient #1

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[edit] References for Reversed halo sign