Ground glass opacity (GGO) refers to the hazy gray areas that can show up in CT scans or X-rays of the lungs. These gray areas indicate increased density inside the lungs.
The term comes from a technique in glassmaking during which the surface of the glass is blasted by sand. This technique gives the glass a hazy white or frosted appearance.
There are many potential causes of GGO, including infections, inflammation, and growths. One 2020 review also found that GGO was the most common anomaly among people with COVID-19-related pneumonia.
This article will look at what GGO is, some of its causes, and its treatment options.