Typical, rare and atypical CT findings in COVID-19 pneumonia: A pictorial review

Objectives: The objective of this pictorial review is to make radiologists and clinicians familiar with the typical, atypical and rare CT findings of COVID-19 pneumonia to help in diagnosis as well as in monitoring disease. Main text: Bilateral ground-glass opacities, whether isolated or coexisting with consolidations, and typically in basal, posterior and peripheral lungs are the key findings in COVID-19 pneumonia. With further analysis other typical, atypical and rare CT findings are described and we need to keep in mind that the radiological presentation is dynamic with a rapid evolutive phase, peaking at 10-11 days, and a subsequent absorption phase after 14 days with a decrease in opacities and increase in repairing signs. Conclusion: The presence of typical findings of COVID-19 pneumonia on a chest CT scan during the pandemic outbreak of SARSCoV-2 helps in diagnostic analysis. Chest CT scan has a reported sensitivity of 97-98% in times with a high pre-test probability. Some CT findings (crazy paving pattern and pleural effusion) as well as an increasing percentage of lung opacities are associated with a worse patient outcome, emphasizing the role of chest CT in determining