scholarly journals Clinical and CT features of mild-to-moderate COVID-19 cases after two sequential negative nucleic acid testing results: a retrospective analysis

2020 ◽  
Author(s):  
Yan Rong ◽  
Jing Wang ◽  
Jinfei Tian ◽  
Xinhua Liang ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Clinical Laboratory ◽  
Clinical Symptoms ◽  
Ground Glass Opacity ◽  
Ct Imaging ◽  
Ground Glass ◽  
Imaging Features ◽  
Nucleic Acid Testing ◽  
Imaging Data ◽  
Negative Results

Abstract Background Numerous studies have been focused on the clinical and imaging features among COVID-19 patients positive for SARS-CoV-2, but the data after negative is limited. We aims to describe these features after negative respiratory nucleic acid testing results.Methods From January 31 to February 28, 2020, 51 mild-to-moderate COVID-19 cases (median: 34.0 years and 47.1% male) were retrospectively enrolled. Demographic, clinical, laboratory, and CT imaging data were collected before and after two sequential negative results for respiratory SARS-CoV-2 .Results After negative for respiratory SARS-CoV-2, the clinical symptoms continued to recover and the abnormal imaging were observed for all of the moderate cases. 77.4% of the moderate patients had multi-lobar involvement and lesions were more frequent in the lower lobes. The most common CT imaging manifestations were ground glass opacity (51.6%) and fibrous stripes (54.8%%). Among 12 out of 31 moderate patients with repeated chest CT scan after negative for SARS-CoV-2, 7 patients (58.3%) with ground-glass absorption reduced over 60% within one week, but there were still 4 cases (13.8%) with absorption less than 5%.Conclusions The clinical symptoms and abnormal imaging persisted but continued to recover after negative for respiratory SARS-CoV-2.

scholarly journals Clinical and CT features of mild-to-moderate COVID-19 cases after two sequential negative nucleic acid testing results: a retrospective analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yan Rong ◽  
Fei Wang ◽  
Jinfei Tian ◽  
Xinhua Liang ◽  
Jing Wang ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Clinical Laboratory ◽  
Clinical Symptoms ◽  
Ct Imaging ◽  
Chinese Patients ◽  
Ground Glass ◽  
Imaging Features ◽  
Imaging Findings ◽  
Imaging Data ◽  
Before And After

Abstract Background The clinical and imaging features of patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections that progressed to coronavirus disease 2019 (COVID-19) have been explored in numerous studies. However, little is known about these features in patients who received negative respiratory nucleic acid test results after the infections resolved. In this study, we aim to describe these features in a group of Chinese patients. Methods This retrospective study includes 51 patients with mild-to-moderate COVID-19 (median age: 34.0 years and 47.1% male) between January 31 and February 28, 2020. Demographic, clinical, laboratory, and computed tomography (CT) imaging data were collected before and after two consecutive negative respiratory SARS-CoV-2 tests. Results Following a negative test result, the patients’ clinical symptoms continued to recover, but abnormal imaging findings were observed in all moderate cases. Specifically, 77.4% of patients with moderate COVID-19 exhibited multi-lobar lung involvement and lesions were more frequently observed in the lower lobes. The most common CT imaging manifestations were ground-glass opacities (51.6%) and fibrous stripes (54.8%%). Twelve of the 31 patients with moderate COVID-19 underwent repeated chest CT scans after a negative SARS-CoV-2 test. Among them, the ground-glass opacities decreased by > 60% within 1 week in seven patients (58.3%), but by < 5% in four patients (13.8%). Conclusions Following a positive and subsequent negative SARS-CoV-2 tests, patients with COVID-19 continued to recover despite exhibiting persistent clinical symptoms and abnormal imaging findings.

scholarly journals Early CT features of COVID-19 pneumonia, association with patients’ age and duration of presenting complaint

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Reem M. EL Kady ◽  
Hosam A. Hassan ◽  
Tareef S. Daqqaq ◽  
Rania Makboul ◽  
Hanan Mosleh Ibrahim
Keyword(s):  
Pleural Effusion ◽  
Ground Glass Opacity ◽  
Ct Imaging ◽  
Older Age ◽  
Ground Glass ◽  
Imaging Features ◽  
Age Group ◽  
Patient Age ◽  
Atypical Features ◽  
Patient Âgé

Abstract Background Coronavirus disease (COVID-19) is a respiratory syndrome with a variable degree of severity. Imaging is a vital component of disease monitoring and follow-up in coronavirus pulmonary syndromes. The study of temporal changes of CT findings of COVID-19 pneumonia can help in better understanding of disease pathogenesis and prediction of disease prognosis. In this study, we aim to determine the typical and atypical CT imaging features of COVID-19 and discuss the association of typical CT imaging features with the duration of the presenting complaint and patients’ age. Results The lesions showed unilateral distribution in 20% of cases and bilateral distribution in 80% of cases. The lesions involved the lower lung lobes in 30% of cases and showed diffuse involvement in 58.2% of cases. The lesions showed peripheral distribution in 74.5% of cases. The most common pattern was multifocal ground glass opacity found in 72.7% of cases. Atypical features like cavitation and pleural effusion can occur early in the disease course. There was significant association between increased number of the lesions, bilaterality, diffuse pattern of lung involvement and older age group (≥ 50 years old) and increased duration of presenting complaint (≥ 4 days). There was significant association between crazy-paving pattern and increased duration of presenting complaint. No significant association could be detected between any CT pattern and increased patient age. Conclusion The most common CT feature of COVID-19 was multifocal ground glass opacity. Atypical features like cavitation and pleural effusion can occur early in the course of the disease. Our cases showed more extensive lesions with bilateral and diffuse patterns of distribution in the older age group and with increased duration of presenting complaint. There was a significant association between crazy-paving pattern and increased duration of presenting complaint. No significant association could be detected between any CT pattern and increased patient age.

scholarly journals Can CT imaging features of ground-glass opacity predict invasiveness? A meta-analysis

2018 ◽  
Vol 9 (4) ◽  
pp. 452-458 ◽  
Author(s):  
Jian Dai ◽  
Guoyou Yu ◽  
Jianqiang Yu
Keyword(s):  
Meta Analysis ◽  
Ground Glass Opacity ◽  
Ct Imaging ◽  
Ground Glass ◽  
Imaging Features

scholarly journals Analysis and Prediction of COVID-19 Patients’ False Negative Results for SARS-CoV-2 Detection with Pharyngeal Swab Specimen: A Retrospective Study

2020 ◽  
Author(s):  
Hui Xu ◽  
Li Yan ◽  
Chun (Martin) Qiu ◽  
Bo Jiao ◽  
Yanyan Chen ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Time Window ◽  
Clinical Symptoms ◽  
False Negative ◽  
Ct Imaging ◽  
Nucleic Acid Detection ◽  
False Negatives ◽  
Negative Results ◽  
False Negative Results ◽  
Blood Routine

ABSTRACTBackgroundFalse negative results of SARS-CoV-2 nucleic acid detection pose threats to COVID-19 patients and medical workers alike.ObjectiveTo develop multivariate models to determine clinical characteristics that contribute to false negative results of SARS-CoV-2 nucleic acid detection, and use them to predict false negative results as well as time windows for testing positive.DesignRetrospective Cohort Study (Ethics number of Tongji Hospital: No. IRBID: TJ-20200320)SettingA database of outpatients in Tongji Hospital (University Hospital) from 15 January 2020 to 19 February 2020.Patients1,324 outpatients with COVID-19MeasurementsClinical information on CT imaging reports, blood routine tests, and clinic symptoms were collected. A multivariate logistic regression was used to explain and predict false negative testing results of SARS-CoV-2 detection. A multivariate accelerated failure model was used to analyze and predict delayed time windows for testing positive.ResultsOf the 1,324 outpatients who diagnosed of COVID-19, 633 patients tested positive in their first SARS-CoV-2 nucleic acid test (47.8%), with a mean age of 51 years (SD=14.9); the rest, which had a mean age of 47 years (SD=15.4), tested negative in the first test. “Ground glass opacity” in a CT imaging report was associated with a lower chance of false negatives (aOR, 0.56), and reduced the length of time window for testing positive by 26%. “Consolidation” was associated with a higher chance of false negatives (aOR, 1.57), and extended the length of time window for testing positive by 44%. In blood routine tests, basophils (aOR, 1.28) and eosinophils (aOR, 1.29) were associated with a higher chance of false negatives, and were found to extend the time window for testing positive by 23% and 41%, respectively. Age and gender also affected the significantly.LimitationData were generated in a large single-center study.ConclusionTesting outcome and positive window of SARS-CoV-2 detection for COVID-19 patients were associated with CT imaging results, blood routine tests, and clinical symptoms. Taking into account relevant information in CT imaging reports, blood routine tests, and clinical symptoms helped reduce a false negative testing outcome. The predictive AFT model, what we believe to be one of the first statistical models for predicting time window of SARS-CoV-2 detection, could help clinicians improve the accuracy and efficiency of the diagnosis, and hence, optimizes the timing of nucleic acid detection and alleviates the shortage of nucleic acid detection kits around the world.Primary Funding SourceNone.

scholarly journals Improved Early Recognition of Coronavirus Disease-2019 (COVID-19): Single-Center Data from a Shanghai Screening Hospital

2020 ◽  
Vol 23 (4) ◽  
pp. 272-276 ◽  
Author(s):  
Ling Peng ◽  
Kang-Yong Liu ◽  
Fei Xue ◽  
Ya-Fang Miao ◽  
Ping-An Tu ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Clinical Laboratory ◽  
Clinical Symptoms ◽  
Early Recognition ◽  
Case Reports ◽  
Clinical Manifestations ◽  
Nucleic Acid Testing ◽  
Single Center ◽  
Cross Sectional ◽  
Epidemiological Characteristics

Background: In December 2019, an outbreak of a novel coronavirus disease (COVID-19; previously known as 2019-nCoV) was reported in Wuhan, Hubei province, China, which has subsequently affected more than 200 countries worldwide including Europe, North America, Oceania, Africa and other places. The number of infected people is rapidly increasing, while the diagnostic method of COVID-19 is only by nucleic acid testing. Objective: To explain the epidemiological characteristics, clinical features, imaging manifestations and to judge diagnostic value of COVID-19 by analyzing the clinical data of COVID-19 suspected and confirmed patients in a non-outbreak, Shanghai, China. To clarify the early epidemiology and clinical characteristics about COVID-19. Methods: Cross-sectional, single-center case reports of the 86 patients screened at Zhoupu Hospital in Pudong New District, Shanghai, China, from January 23 to February 16, 2020. Epidemiology, demography, clinical, laboratory and chest CTs were collected and analyzed. The screened patients were divided into COVID-19 and non-COVID-19 based on nucleic acid test results. Results: Of the 86 screened patients, 11 were confirmed (12.8%) by nucleic acid testing (mean age 40.73 ± 11.32, 5 males). No significant differences were found in clinical symptoms including fever, cough, dyspnea, sore throat, and fatigue (P > 0.05). No statistical difference was observed in plasma C-reactive protein (CRP) between the two groups (COVID-19 and non-COVID-19 ) of patients (P = 0.402), while the white blood cell count and lymphocyte count of the confirmed patients were slightly lower than those of the suspected patients (P < 0.05). Some non-COVID-19 chest CTs also showed subpleural lesions, such as ground-glass opacities (GGO) combined with bronchiectasis; or halo nodules distributed under the pleura with focal GGO; consolidation of subpleural distribution or combined with air bronchi sign and vascular bundle sign, etc. Conclusion: The early clinical manifestations and imaging findings of COVID-19 are not characteristic in non-outbreak areas. Etiological testing should be performed as early as possible for clinically suspected patients.

scholarly journals Comparison of initial HRCT features of COVID-19 pneumonia and other viral pneumonias

2020 ◽  
Author(s):  
Yilong Huang ◽  
Yuanming Jiang ◽  
Li Wu ◽  
Wenfang Yi ◽  
Jiyao Ma ◽  
...  
Keyword(s):  
Influenza A ◽  
Clinical Symptoms ◽  
Early Stage ◽  
Ground Glass Opacity ◽  
Influenza B Virus ◽  
Influenza B ◽  
Imaging Features ◽  
Imaging Data ◽  
High Resolution Computed Tomography ◽  
Pleural Thickening

Abstract Background: Multicenter retrospective comparison of the first high-resolution computed tomography (HRCT) findings of coronavirus disease 2019 (COVID-19) and other viral pneumonias.Methods: We retrospectively collected clinical and imaging data from 254 cases of confirmed viral pneumonia in 20 hospitals in Yunnan Province, China, from March 1, 2015, to March 15, 2020. According to the virus responsible for the pneumonia, the pneumonias were divided into non-COVID-19 (133 cases) and COVID-19 (121 cases). The non-COVID-19 pneumonias included 3 types: cytomegalovirus (CMV) (31 cases), influenza A virus (82 cases), and influenza B virus (20 cases). The differences in the basic clinical characteristics, lesion distribution, location and imaging signs among the four viral pneumonias were analyzed and compared.Results: Fever and cough were the most common clinical symptoms of the four viral pneumonias. Compared with the COVID-19 patients, the non-COVID-19 patients had higher proportions of fatigue, sore throat, expectorant and chest tightness (all p<0.000). In addition, in the CMV pneumonia patients, the proportion of patients with combined acquired immunodeficiency syndrome (AIDS) and leukopenia were high (all p<0.000). Comparisons of the imaging findings of the four viral pneumonias showed that pulmonary lesions of COVID-19 were more likely to occur in the peripheral and lower lobes of both lungs, while those of CMV pneumonia were diffusely distributed. Compared with the non-COVID-19 pneumonias, COVID-19 pneumonia was more likely to present as ground-glass opacity (GGO), intralobular interstitial thickening, vascular thickening and halo sign (all p<0.05). In addition, in the early stage of COVID-19, extensive consolidation, fibrous stripes, subpleural lines, crazy-paving pattern, tree-in-bud, mediastinal lymphadenectasis, pleural thickening and pleural effusion were rare (all p<0.05).Conclusion: The HRCT findings of COVID-19 pneumonia and other viral pneumonias overlapped significantly, but many important differential imaging features could still be observed.

scholarly journals Computed Tomography (CT) Imaging Features of Patients with COVID-19: Systematic Review and Meta-Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Ephrem Awulachew ◽  
Kuma Diriba ◽  
Asrat Anja ◽  
Eyob Getu ◽  
Firehiwot Belayneh
Keyword(s):  
Ground Glass Opacity ◽  
Ct Imaging ◽  
Chest Ct ◽  
Ground Glass ◽  
Cochrane Library ◽  
Imaging Features ◽  
Severe Respiratory Distress ◽  
Ct Findings ◽  
Open Access Journals ◽  
Bilateral Lung

Introduction. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a highly contagious disease, and its first outbreak was reported in Wuhan, China. A coronavirus disease (COVID-19) causes severe respiratory distress (ARDS). Due to the primary involvement of the respiratory system, chest CT is strongly recommended in suspected COVID-19 cases, for both initial evaluation and follow-up. Objective. The aim of this review was to systematically analyze the existing literature on CT imaging features of patients with COVID-19 pneumonia. Methods. A systematic search was conducted on PubMed, Embase, Cochrane Library, Open Access Journals (OAJ), and Google Scholar databases until April 15, 2020. All articles with a report of CT findings in COVID-19 patients published in English from the onset of COVID-19 outbreak to April 20, 2020, were included in the study. Result. From a total of 5041 COVID-19-infected patients, about 98% (4940/5041) had abnormalities in chest CT, while about 2% have normal chest CT findings. Among COVID-19 patients with abnormal chest CT findings, 80% (3952/4940) had bilateral lung involvement. Ground-glass opacity (GGO) and mixed GGO with consolidation were observed in 2482 (65%) and 768 (18%) patients, respectively. Consolidations were detected in 1259 (22%) patients with COVID-19 pneumonia. CT images also showed interlobular septal thickening in about 691 (27%) patients. Conclusion. Frequent involvement of bilateral lung infections, ground-glass opacities, consolidation, crazy paving pattern, air bronchogram signs, and intralobular septal thickening were common CT imaging features of patients with COVID-19 pneumonia.

scholarly journals Clinical and imaging features of pediatric COVID-19

2020 ◽  
Vol 46 (1) ◽  
Author(s):  
Yu Zhang ◽  
Ru-Ming Xie ◽  
Yu-Lin He ◽  
Li-Hong Xing ◽  
Li Dong ◽  
...  
Keyword(s):  
Nasal Congestion ◽  
Lower Lobe ◽  
Ground Glass Opacity ◽  
Middle Lobe ◽  
Ct Imaging ◽  
Imaging Features ◽  
Imaging Data ◽  
Runny Nose ◽  
Right Middle Lobe ◽  
The Right

Abstract Background Pediatric COVID-19 is relatively mild and may vary from that in adults. This study was to investigate the epidemic, clinical, and imaging features of pediatric COVID-19 pneumonia for early diagnosis and treatment. Methods Forty-one children infected with COVID-19 were analyzed in the epidemic, clinical and imaging data. Results Among 30 children with mild COVID-19, seven had no symptoms, fifteen had low or mediate fever, and eight presented with cough, nasal congestion, diarrhea, headache, or fatigue. Among eleven children with moderate COVID-19, nine presented with low or mediate fever, accompanied with cough and runny nose, and two had no symptoms. Significantly (P < 0.05) more children had a greater rate of cough in moderate than in mild COVID-19. Thirty children with mild COVID-19 were negative in pulmonary CT imaging, whereas eleven children with moderate COVID-19 had pulmonary lesions, including ground glass opacity in ten (90.9%), patches of high density in six (54.5%), consolidation in three (27.3%), and enlarged bronchovascular bundles in seven (63.6%). The lesions were distributed along the bronchus in five patients (45.5%). The lymph nodes were enlarged in the pulmonary hilum in two patients (18.2%). The lesions were presented in the right upper lobe in two patients (18.1%), right middle lobe in one (9.1%), right lower lobe in six (54.5%), left upper lobe in five (45.5%), and left lower lobe in eight (72.7%). Conclusions Children with COVID-19 have mild or moderate clinical and imaging presentations. A better understanding of the clinical and CT imaging helps ascertaining those with negative nucleic acid and reducing misdiagnosis rate for those with atypical and concealed symptoms.

scholarly journals Gejala Klinis dan Pemeriksaan Penunjang pada Neonatus Terinfeksi COVID-19

e-CliniC ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jason Rampengan ◽  
Johnny Rompis ◽  
Valentine Umboh
Keyword(s):  
Cohort Study ◽  
Case Report ◽  
Literature Review ◽  
Observational Study ◽  
Ct Scan ◽  
Clinical Symptoms ◽  
Ground Glass Opacity ◽  
Google Scholar ◽  
Ground Glass ◽  
Laboratory Examinations

Abstract: COVID-19 is spreading at an extremely rapid rate and can affect all age groups, albeit, information about clinical symptoms and laboratory examinations of COVID-19 I in neonates is still quite limited. This study was aimed to determine the clinical symptoms, radiographic examinations especially CT-scans, and laboratory tests that could appear in neonates suffering from COVID-19. This was a literature review study using three databases, namely Pubmed, Clinical Key, and Google Scholar. The keywords used were Covid-19 / SARS-CoV-2 AND Neonatus AND sign and symptoms AND laboratory. The selection based on inclusion and exclusion criteria, obtained 15 case report studies, three retrospective studies, one observational study, and one cohort study. The review revealed that the most frequent clinical features that appeared were fever (54.8%), dyspnoea (35.4%), and cough (29%). Meanwhile, for CT-Scan radiographs, there were 14 of 31 neonates (45.2%) did not show any abnormalities or normal. The most frequent abnormal image was ground glass opacity (GGO) (29%). Among laboratory examinations, lymphopenia was the most common abnormality (32.2%). Moreover, leukocytosis, leukopenia, thrombocytopenia, increased PCT, AST, etc. could also occur. Of all the reviewed literatures, there were no death cases of neonates died due to COVID-19. In conclusion, fever, dyspnea, cough, and lymphopenia are the most common findings as well as GGO in the CT-Scan radiograph.Keywords: COVID-19, neonates Abstrak: COVID-19 menyebar dengan sangat pesat dan dapat menjangkiti semua kelompok usia namun informasi mengenai gejala klinis dan pemeriksaan laboratorium terhadap kelompok neonatus masih terbatas. Penelitian ini bertujuan untuk mengetahui gambaran klinis, pemeriksaan radiografi khususnya CT-Scan, dan pemeriksaan laboratorium yang bisa muncul pada neonatus dengan COVID-19. Jenis penelitian ialah literature review dengan pencarian data menggunakan tiga database yaitu Pubmed, Clinical Key, dan Google Scholar. Kata kunci yang digunakan yaitu Covid-19/ SARS-CoV-2 AND Neonatus AND sign and symptom AND laboratory. Hasil seleksi berdasarkan kriteria inklusi dan ekslusi mendapatkan 15 penelitian case report, tiga retrospective study, satu observational study, dan satu cohort study. Hasil kajian menunjukkan bahwa gambaran klinis yang paling sering muncul ialah demam (54,8%), sesak (35,4%), dan batuk (29%). Pemeriksaan radiografi CT-Scan, neonatus yang tidak menunjukkan kelainan (normal) terdapat pada 14 dari 31 neonatus diamati (45,2%), sedangkan kelainan yang sering muncul ialah ground glass opacity/GGO (29%). Pada pemeriksaan laboratorium, limfopenia merupakan kelainan tersering (32,2%), sedangkan leukositosis, leukopenia, trombositopenia, peningkatan PCT, AST, dll juga bisa terjadi. Dari semua literatur yang dikaji, tidak ditemukan kasus kematian neonatus akibat COVID-19. Simpulan penelitian ini ialah gambaran klinis yang paling sering muncul pada neonatus ialah demam, sesak, dan batuk, limfopenia, dan GGO pada CT-Scan.Kata kunci: COVID-19, neonatus

scholarly journals Analysis of Chest CT Results of Coronavirus Disease 2019 (COVID-19) Patients at First Follow-Up

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Lingshan Zhong ◽  
Shuo Zhang ◽  
Jigang Wang ◽  
Xinqian Zhao ◽  
Kai Wang ◽  
...  
Keyword(s):  
Ground Glass Opacity ◽  
Chest Ct ◽  
Ground Glass ◽  
Imaging Data ◽  
Exclusion Criteria ◽  
Pulmonary Lesions ◽  
Normal Chest ◽  
Time Of Admission ◽  
Better Than

Objective. To investigate the dissipation and outcomes of pulmonary lesions at the first follow-up of patients who recovered from moderate and severe cases of COVID-19. Methods. From January 21 to March 3, 2020, a total of 136 patients with COVID-19 were admitted to our hospital. According to inclusion and exclusion criteria, 52 patients who recovered from COVID-19 were included in this study, including 33 moderate cases and 19 severe cases. Three senior radiologists independently and retrospectively analyzed the chest CT imaging data of 52 patients at the last time of admission and the first follow-up after discharge, including primary manifestations, concomitant manifestations, and degree of residual lesion dissipation. Results. At the first follow-up after discharge, 16 patients with COVID-19 recovered to normal chest CT appearance, while 36 patients still had residual pulmonary lesions, mainly including 33 cases of ground-glass opacity, 5 cases of consolidation, and 19 cases of fibrous strip shadow. The proportion of residual pulmonary lesions in severe cases (17/19) was statistically higher than in moderate cases (19/33) ( χ 2   =   5 . 759 , P < 0.05 ). At the first follow-up, residual pulmonary lesions were dissipated to varying degrees in 47 cases, and lesions remained unchanged in 5 cases. There were no cases of increased numbers of lesions, enlargement of lesions, or appearance of new lesions. The dissipation of residual pulmonary lesions in moderate patients was statistically better than in severe patients (Z = −2.538, P < 0.05 ). Conclusion. Clinically cured patients with COVID-19 had faster dissipation of residual pulmonary lesions after discharge, while moderate patients had better dissipation than severe patients. However, at the first follow-up, most patients still had residual pulmonary lesions, which were primarily ground-glass opacity and fibrous strip shadow. The proportion of residual pulmonary lesions was higher in severe cases of COVID-19, which required further follow-up.

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