Dark bronchus sign

The dark bronchus sign is the appearance of a relatively darker bronchus as compared to adjacent ground glass opacity. If the ground glass opacity progresses to consolidation, air bronchograms will be visualized. 

This sign is useful to identify diffuse ground glass opacity on HRCT chest in cases of Pneumocystis jirovecii pneumonia who may present with a normal or equivocal chest radiograph in the early course of the disease 1.

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Article information

rID: 30516
System: Chest
Section: Signs
Tag: cases
Synonyms or Alternate Spellings:
  • Black bronchus sign

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