Pseudocavitation sign at chest CT scan due to COVID-19 pneumonia: A report of 5 cases and literature review

Fig. 1. 72-year-old male patient with COVID-19 pneumonia. Findings: (a, c) Initial scans showing thin walled-cystic changes (arrow) on the right lung without signs of pneumonia on the 7th day of the onset of the illness. (b, d) Follow-up scan 17 days later showed added pneumonia features bilaterally with pseudocavities (arrow) as low-attenuated cystic areas among consolidation.

Fig. 2. 65-year-old male patient with COVID-19 pneumonia. Findings: (a, d) Initial scan without pneumonia features showing insignificant low-attenuated areas (arrow) in right lower lobe. (b, e) Follow-up scan on the ninth day of the illness pointing the pseudocavities (arrow) among the diffuse peripherally located GGO on the right and left lower lobes. (c, f) The third CT scan 5 months after discharge of the patient showing regressed GGOs and barely distinguishable air spaces (arrow), similar to imaging before COVID involvement.

Fig. 3. 72-year-old male patient with COVID-19 pneumonia. Findings: (a, c) CT scan showing emphysematous and cystic pulmonary changes before the pneumonia features added. (b, d) Second chest scan taken 15 days later showing bilateral lung involvement with marked pseudocavities (arrow) among the consolidation.

Fig. 4. 63-year-old male patient with COVID-19 pneumonia. Findings: (a) CT scan showing lucent area among normal lung parenchyma. (b) Second chest scan taken 8 days later showing a spare area (arrow) among the GGO.

Fig. 5. 43-year-old female patient with COVID-19 pneumonia. Findings: (a) CT scan showing thin walled cyst among normal lung parenchyma. (b) Second chest scan taken 20 days later showing a pseudocyst (arrow) among the consolidation.