Fig. 15From: Frequency of atypical pulmonary manifestations of COVID-19 patients on chest CT-scan: a cross-sectional studyAir bubble sign in a 37-year-old man with COVID-19 pneumonia. Axial non-enhanced chest CT scan image on the lung window shows a small air-containing space in the context of air space opacity in LLLÂ (red frame)Back to article page