<P> In radiology, ground glass opacity (GGO) is a nonspecific finding on computed tomography (CT) scans that indicates a partial filling of air spaces in the lungs by exudate or transudate, as well as interstitial thickening or partial collapse of lung alveoli . </P> <P> The differential diagnosis of the many causes of GGO includes pulmonary edema, infections (including cytomegalovirus and Pneumocystis carinii pneumonia), various noninfectious interstitial lung diseases (such as hypersensitivity pneumonitis, Hamman - Rich syndrome), diffuse alveolar hemorrhage, and cryptogenic organizing pneumonia . </P>

What does ground glass appearance in lungs mean