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:

ADVERTISEMENT: Supporters see fewer/no ads