Figure 3.

CT findings of COVID-19, overshadowed by postoperative changes at the onset, shows progression on repeated CT of the chest and typical signs of progressive viral pneumonia. A, A 61-year-old male patient (case ID 5) 6 days after left lower lobectomy. He had intermittent fever for 3 days with CT findings of emphysema, reticular areas of increased opacity, and irregular patchy consolidation. His repeat CT scan after 5 days shows increased extent and intensity of lesions, suspicious for viral pneumonia (E). B, Chest CT of a 56-year-old female patient (case ID 3) 11 days after left lower lobectomy shows irregular subsolid patchy opacity in left upper lobe. After 5 days (F), the lesion has increased in size and number, with consolidation, pleural effusion and interlobular septal thickening. C, CT of the chest of a 66-year-old female patient (case ID 10) 10 days after left lung wedge resection of upper lobe with basal segmentectomy. CT scan shows small irregular GGO in the right upper lobe and subpleural cord-like consolidation (C), which were not rare as postoperative reactive change. After 8 days, CT shows typical signs of viral pneumonia (G): diffuse ground glass opacifications with “paving stone” signs and, irregular subpleural cord-like consolidation. D, A 68-year-old male patient (case ID 2) 12 days after right lower lobectomy. Chest CT (D) shows pneumothorax, subcutaneous emphysema, postoperative changes, and inflammation around chest drain. After 18 days, he had sudden onset of fever and CT scan revealed (H) multiple diffuse GGOs in the lung peripheries with reticular consolidation.