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Related Experiment Videos

Rounded atelectasis formation following decrease of pleural effusion: a case report

M Sasaki1, K Satoh, K Fukunaga

  • 1Department of Radiology, Kagawa Medical University, Japan.

Radiation Medicine
|November 1, 1996
PubMed
Summary

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Rounded atelectasis (RA) can appear as a distinct mass after pleural effusion resolves. A new sign, the horizontal comet-tail sign, helps identify RA on CT scans, potentially avoiding further unnecessary tests.

Area of Science:

  • Radiology
  • Pulmonology
  • Medical Imaging

Background:

  • Pleural effusion is excess fluid accumulation in the pleural space.
  • Rounded atelectasis (RA) is a form of lung collapse.
  • Distinguishing RA from other lung masses can be challenging.

Observation:

  • A case of rounded atelectasis (RA) was observed continuously following a decrease in pleural effusion.
  • The collapsed right lower lobe adjacent to the effusion transformed from wedge-shaped consolidation to an oval, flat formation.
  • Computed tomography (CT) revealed vessels and bronchi curving into the RA, termed the 'horizontal comet-tail sign'.

Findings:

  • The horizontal comet-tail sign, characterized by curving vessels and bronchi, is a key indicator of RA.
  • This sign aids in differentiating RA from other lung pathologies.

Related Experiment Videos

  • RA's characteristic shape change was observed during the resolution of pleural effusion.

    • Implications:

    • The horizontal comet-tail sign on CT can facilitate the diagnosis of RA.
    • Accurate identification of RA may prevent unnecessary invasive procedures or further diagnostic examinations.
    • This finding contributes to the understanding ofRA's imaging characteristics in the context of pleural effusion resolution.