Round atelectasis

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[edit] Discussion of Round atelectasis

  • Pathogenesis of round atelectasis is not certain, but it is thought to be due to an inflammatory reaction and fibrosis in the superficial layer of the pleura.
  • As the fibrous tissue matures, it contracts, causing pleura to fold into the lung, which in turn causes atelectasis.
  • Round atelectasis is almost always asymptomatic and is detected on chest radiographs obtained for other reasons.
  • A history of asbestos exposure is frequently (in 70% of cases) present. Asbestos-related round atelectasis is also known as asbestos pseudotumor or Blesovsky syndrome.
  • Conditions such as congestive heart failure, pulmonary infarction, Dressler syndrome, parapneumonic effusion, tuberculous effusion, and nonspecific pleurisy can precede round atelectsis formation.
  • Lung cancer is the main differential diagnosis.
  • After diagnosis, a follow-up CT should be obtained to exclude lung cancer.

[edit] Imaging Findings for Round atelectasis

[edit] Plain film

  • The typical chest radiographic appearance is of a rounded peripheral "mass" with or without lung distortion.
  • Pleural thickening is usually seen.

[edit] CT

  • The CT features are:
    • A round or oval mass that abuts the pleura
    • Has sharp lung borders
    • Has a fuzzy border which projects to the hila (Origin of Comet tail sign)
    • a "comet tail" of bronchovascular structures going into the mass (Comet tail sign).
    • Thickening of the adjacent pleura.
  • Volume loss is often, but not invariably, apparent.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Round atelectasis