In radiology, ground glass opacity (GGO) is a nonspecific finding on radiographs and computed tomography (CT) scans. It consists of a hazy opacity that does not obscure the underlying bronchial structures or pulmonary vessels, and 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.[1]:95