Fig. 3

Combined morphologic/volumetric analysis. a A 33-year-old male patient proved with COVID-19 complaining of dyspnea, tachypnea, and 94% O₂RA (consistent with border-line severity). Axial CT lung window and coronal 2D computed volumetric analysis showing bilateral widespread patchy pure GGOs. 3D computed volumetric analysis after threshold interval adjustment revealed 1856 cc pathological lung volume, 5204 cc total lung volume, and 36% lung involvement. Overall CT coding (M1-S3). b A 61-year-old male patient proved with COVID-19 complaining of dyspnea, tachypnea, and 92% O_2-RA (clinically severe). Axial CT lung window and coronal 2D computed volumetric analysis show bilateral patchy GGOs mixed with early fibrotic changes and mild parenchymal distortion. 3D computed volumetric analysis after threshold interval adjustment revealed 1044 cc pathological lung volume, 4207 cc total lung volume and 25% lung involvement. Overall CT coding (M6-S3). c A 67-year-old male patient proved with COVID-19 complaining of severe dyspnea and 82% O₂RA (critical patient indicated for intubation). Coronal CT lung window and coronal 2D computed volumetric analysis showing bilateral diffuse lung involvement with GGOs and super-added septal thickening “crazy-paving pattern.” 3D computed volumetric analysis after threshold interval adjustment revealed 1446 cc pathological lung volume, 2281 cc total lung volume, and 64% lung involvement. Overall CT coding: M8-S4 = DAD