An example double-grade discrepant case for COVID-RADS. In the absence of other abnormal findings, Readers 1 and 2 considered the abnormality (black arrow) as a single GGO and therefore called it COVID-RADS 2A and CO-RADS 3, implying equivocal and moderate levels of suspicion for COVID-19, respectively. Reader 3, however, considered this as an area of fibrosis and called it COVID-RADS 0 and CO-RADS 1, thereby giving this case a very low level of suspicion. GGO, ground glass opacification.