**Abstract**

A hazy increase in opacity in the lung parenchyma without obscuring the underlying bronchovascular structures on chest CT is called a ground-glass pattern. Ground-glass opacities occur as a result of a wide variety of interstitial and alveolar diseases. It does not represent a specific finding. Coronaviruses are enveloped RNA viruses that can also infect many animal species. They also cause mild or severe respiratory infections in humans. The pandemic caused by SARS-CoV-2 has suddenly turned into the most important health problem of our day. Chest CT is frequently used due to the limited use of chest radiographs in COVID-19 disease. Thus, the ground glass pattern, which is the most common finding of this virus in CT, entered our lives intensively. In this article, we examined the concept of ground glass, its causes, and differential diagnosis.

**Keywords:** COVID-19, chest CT, ground-glass opacity
