Which abnormalities cause increased lung opacity on CT scans in bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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CT patterns of disease may be broken down into abnormalities that cause either increased or decreased lung opacity. [62] Abnormalities that cause increased lung opacity include the following:

  • Nodular pattern, based on the anatomy of the secondary pulmonary lobule – A centrilobular pattern is further characterized by the presence or absence of tree-in-bud morphology, the presence of which is almost always seen in infection. Its absence is likely to expand the differential beyond infectious processes. Other nodules include perilymphatic nodules and random nodules.

  • Linear patter - Interlobular septal thickening (smooth, nodular, irregular), parenchymal bands, subpleural lines, and irregular linear opacities may be seen.

  • Reticular pattern

  • Ground-glass opacity

  • Consolidation

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