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Lipoid pneumonia: CT findings

K S Lee1, N L Müller, V Hale

  • 1Department of Radiology, University of British Columbia, Vancouver, Canada.

Journal of Computer Assisted Tomography
|January 1, 1995
PubMed
Summary

Computed tomography (CT) can identify fat in patients with lipoid pneumonia, showing areas of low attenuation or soft tissue density. This helps diagnose lipoid pneumonia, especially when clinical history of oily substance intake is known.

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Area of Science:

  • Radiology
  • Pulmonary Medicine
  • Pathology

Background:

  • Lipoid pneumonia is a rare condition caused by the aspiration or inhalation of lipid-containing substances.
  • Diagnosis can be challenging due to nonspecific clinical and imaging findings.

Purpose of the Study:

  • To evaluate the characteristic computed tomography (CT) findings in patients diagnosed with lipoid pneumonia.
  • To correlate CT findings with histopathological or cytological confirmation.

Main Methods:

  • Retrospective review of chest radiography and CT scans from six patients with confirmed lipoid pneumonia.
  • Two independent observers assessed imaging findings.
  • Diagnosis confirmed by biopsy or bronchoalveolar lavage.
  • Clinical history of oily substance intake was retrospectively obtained.

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Main Results:

  • Chest radiography showed airspace consolidation, mass-like lesions, or a reticulonodular pattern.
  • CT revealed diffuse or localized consolidation, subpleural fibrosis, and in some cases, fat with low attenuation.
  • Decreased attenuation, higher than subcutaneous fat, was observed in diffuse consolidation cases.

Conclusions:

  • CT findings in lipoid pneumonia can include areas of low attenuation indicative of fat.
  • Nonspecific low attenuation or soft tissue density areas may also be present on CT.
  • CT is a valuable tool for diagnosing lipoid pneumonia when correlated with clinical history.