Chest CT Findings and Their Temporal Evolution in COVID-19 Pneumonia

Area of Science:

• Radiology
• Infectious Diseases
• Pulmonology

Background:

• Coronavirus disease 2019 (COVID-19) is a pandemic caused by the SARS-CoV-2 virus.
• The virus primarily affects the respiratory tract, with confirmatory diagnosis via RT-PCR.
• Chest CT is crucial for diagnosis, triage, and treatment management of COVID-19 patients.

Purpose of the Study:

• To describe the characteristic chest CT findings in COVID-19 pneumonia.
• To analyze the temporal evolution of these CT findings.
• To highlight the diagnostic utility of CT in COVID-19 management.

Main Methods:

• Retrospective, cross-sectional study of COVID-19 positive patients.
• Review of chest CT images for specific findings: ground-glass opacities, consolidation, crazy-paving, vascular dilatation, etc.
• Recording of axial distribution, ancillary findings, and temporal evolution based on symptom onset to CT scan time.

Main Results:

• Ground-glass opacities and consolidation are key CT features of COVID-19 pneumonia.
• CT findings evolve through stages: early (opacities), progressive (consolidation, crazy-paving, distortion), peak, and late (resolution).
• Opacities show asymmetric, peripheral, subpleural distribution with posterior/lateral predominance and apicobasal gradient.

Conclusions:

• Chest CT enables rapid diagnosis of COVID-19 pneumonia.
• Early diagnosis facilitates timely and appropriate treatment.
• CT imaging is a life-saving tool, particularly in resource-constrained environments.