What are the imaging features of rounded atelectasis?

Updated: Oct 22, 2020
  • Author: Tarun Madappa, MD, MPH; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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Rounded atelectasis is a segmental or subsegmental atelectasis that occurs secondary to visceral pleural thickening and entrapment of lung tissue. Rounded atelectasis is usually located in the lower lobes, the lingula, or the RML. On chest radiographs, rounded atelectasis manifests as a subpleural mass, with bronchovascular structures projecting out of the mass toward the hilum. An associated parietal pleural plaque may be present. The swirl appearance of bronchovascular shadows is called the comet-tail sign. [10]

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