Halo sign (chest)

Last revised by Dr Yuranga Weerakkody on 09 Aug 2021

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:

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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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  • Case 4: granulomatosis with polyangiitis
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  • Case 5: with pulmonary infarcts
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  • Case 6: hemorrhagic pulmonary metastases
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