The confirmed diagnosis of COVID-19 pneumonia requires viral nucleic acid detection in throat swabs, sputum, lower respiratory tract secretions, or blood; while the specificity of this test is strong, its sensitivity is poor  and most patients show multiple negative results. Furthermore, in most patients, lung imaging findings are observed earlier than clinical symptoms, which make imaging examinations crucial for screenings and an accurate diagnosis. Chest CT is now the routine for patients with COVID-19 pneumonia at many institutions. In our experience, some patients with positive CT findings may have initial negative result before they were finally confirmed as COVID-19 pneumonia, and they were easily misdiagnosed as common types of viral pneumonia, especially in the non-epidemic area. In addition, there have been a few reports about COVID-19 pneumonia findings on chest CT; however, the reported CT findings of COVID-19 pneumonia were extremely similar to common types of viral pneumonia. To the best of our knowledge, no study so far has compared CT findings between COVID-19 pneumonia and other types of viral pneumonia. Hence, the primary objective of our study was to compare the pulmonary CT findings of patients with COVID-19 pneumonia with those with other types of viral pneumonia.