Halo sign (chest)

Last revised by Daniel J Bell on 1 Jan 2022

The halo sign in chest imaging is a feature seen on lung window settings, 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:

Cases and figures

  • Figure 1: angioinvasive aspergillosis - gross pathology
  • Case 1: halo sign with angioinvasive aspergillosis
  • Case 2: with peritumoural hemorrhage
  • Case 3: rectal cancer metastasis
  • Case 4: granulomatosis with polyangiitis
  • Case 5: with pulmonary infarcts
  • Case 6: hemorrhagic pulmonary metastases
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