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06.06.2023 | Original articles

Comparison between original SARS-CoV-2 strain and omicron variant on thin-section chest CT imaging of COVID-19 pneumonia

verfasst von: Zeng pingping, Zhou Yanyu, Sun Xuri, Huang Qiming, Wang Yi, Tan Guoliang, MD

Erschienen in: Die Radiologie | Sonderheft 2/2023

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Abstract

Objectives

We investigated different computed tomography (CT) features between Omicron-variant and original-strain SARS-CoV‑2 pneumonia to facilitate the clinical management.

Materials and methods

Medical records were retrospectively reviewed to select patients with original-strain SARS-CoV‑2 pneumonia from February 22 to April 22, 2020, or Omicron-variant SARS-CoV‑2 pneumonia from March 26 to May 31, 2022. Data on the demographics, comorbidities, symptoms, clinical types, and CT features were compared between the two groups.

Results

There were 62 and 78 patients with original-strain or Omicron-variant SARS-CoV‑2 pneumonia, respectively. There were no differences between the two groups in terms of age, sex, clinical types, symptoms, and comorbidities. The main CT features differed between the two groups (p = 0.003). There were 37 (59.7%) and 20 (25.6%) patients with ground-glass opacities (GGO) in the original-strain and Omicron-variant pneumonia, respectively. A consolidation pattern was more frequently observed in the Omicron-variant than original-strain pneumonia (62.8% vs. 24.2%). There was no difference in crazy-paving pattern between the original-strain and Omicron-variant pneumonia (16.1% vs. 11.6%). Pleural effusion was observed more often in Omicron-variant pneumonia, while subpleural lesions were more common in the original-strain pneumonia. The CT score in the Omicron-variant group was higher than that in the original-strain group for critical-type (17.00, 16.00–18.00 vs. 16.00, 14.00–17.00, p = 0.031) and for severe-type (13.00, 12.00–14.00 vs 12.00, 10.75–13.00, p = 0.027) pneumonia.

Conclusion

The main CT finding of the Omicron-variant SARS-CoV‑2 pneumonia included consolidations and pleural effusion. By contrast, CT findings of original-strain SARS-CoV‑2 pneumonia showed frequent GGO and subpleural lesions, but without pleural effusion. The CT scores were also higher in the critical and severe types of Omicron-variant than original-strain pneumonia.

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Titel: Comparison between original SARS-CoV-2 strain and omicron variant on thin-section chest CT imaging of COVID-19 pneumonia
verfasst von: Zeng pingping
Zhou Yanyu
Sun Xuri
Huang Qiming
Wang Yi
Tan Guoliang, MD
Publikationsdatum: 06.06.2023
Verlag: Springer Medizin
Erschienen in: Die Radiologie / Ausgabe Sonderheft 2/2023
Print ISSN: 2731-7048
Elektronische ISSN: 2731-7056
DOI: https://doi.org/10.1007/s00117-023-01147-2

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