Halo sign (chest)

The halo sign in chest imaging is a feature seen on lung window settings (typically HRCT), ground glass opacity surrounding a pulmonary nodule or mass and represents hemorrhage. It is typically seen in angioinvasive aspergillosis.

Histopathologically, it represents a focus of pulmonary infarction surrounded by alveolar hemorrhage.

Other entities that may give a halo sign include:

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Article information

rID: 8702
System: Chest
Section: Signs
Synonyms or Alternate Spellings:
  • CT halo sign
  • Halo sign in chest imaging
  • Thoracic CT halo sign
  • Halo sign in CT chest imaging
  • Halo sign (HS) in chest imaging

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Cases and figures

  • Figure 1: angioinvasive aspergillosis - gross pathology
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  • Case 1: halo sign with angioinvasive aspergillosis
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  • Case 2: with peritumoural hemorrhage
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  • Case 3: rectal cancer metastasis
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