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[Rounded nodular atelectasis: computerized tomography and magnetic resonance appearances]

J Galant1, L Martí-Bonmatí, M Domingo

  • 1Departamento de Diagnóstico por Imagen, Hospital Doctor Peset, Valencia.

Archivos De Bronconeumologia
|November 1, 1994
PubMed
Summary

Rounded atelectasis, a lung collapse mimicking tumors, is best diagnosed with computerized tomography. Key signs include subpleural location and a characteristic arc of proximal vessels, aiding accurate diagnosis and avoiding further procedures.

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Area of Science:

  • Radiology
  • Pulmonology
  • Medical Imaging

Background:

  • Rounded atelectasis is a rare lung condition.
  • Its radiographic appearance can be misdiagnosed as tumors.
  • Accurate differentiation is crucial for patient management.

Purpose of the Study:

  • To evaluate the diagnostic utility of computerized tomography (CT) for rounded atelectasis.
  • To identify key radiological signs for differentiating rounded atelectasis from lung tumors.
  • To establish CT as the primary diagnostic tool for this condition.

Main Methods:

  • Retrospective review of 14 cases of rounded atelectasis.
  • Detailed analysis of CT findings, including location, shape, and associated signs.
  • Comparison with magnetic resonance (MR) imaging in a subset of cases.

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Main Results:

  • All 14 lesions were rounded and subpleural within the visceral pleura.
  • A characteristic arc of proximal vessels directed towards the lesion was present in all cases.
  • Other signs included surrounding parenchymal brightness (10/14), lobar volume loss (7/14), and air bronchograms (7/14).
  • CT proved highly effective, with MR showing limited additional diagnostic value.

Conclusions:

  • Computerized tomography is the most effective imaging modality for diagnosing rounded atelectasis.
  • The arc of proximal vessels is a highly specific radiological sign.
  • When CT findings are definitive, further diagnostic procedures are unnecessary.