Ground glass opacity

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High-resolution CT: increase in density in areas of ground glass and air trapping in lower lobes in patients with hypersensitivity pneumonitis.

In radiology, ground glass opacity (GGO) is a nonspecific finding on computed tomography (CT) scans that indicates a partial filling of air spaces by exudate or transudate, as well as interstitial thickening or partial collapse of lung alveoli.

Possible Diseases[edit]

The differential diagnosis of the many causes of GGO includes pulmonary edema, infections (including cytomegalovirus and Pneumocystis carinii pneumonia), various noninfection interstitial lung diseases (such as hypersensitivity pneumonitis, Hamman-Rich syndrome), diffuse alveolar hemorrhage, and cryptogenic organizing pneumonia.[1]


  1. ^ Jannette Collins, MD and Eric J. Stern, MD (1998). "Ground glass opacity on CT scanning of the chest: What does it mean?". Applied Radiology. Retrieved 2012-02-01. 

External links[edit]