is the seventh member of the family of coronaviruses that infect humans (1) and induces coronavirus disease 2019 (COVID-19). Human coronaviruses have neuroinvasive capacities and may be neurovirulent by two main mechanisms (2-4): viral replication into glial or neuronal cells of the brain or autoimmune reaction with a misdirected host immune response (5). Thus, a few cases of acute encephalitislike syndromes with human coronaviruses were reported in the past 2 decades (5-8). In regard to COVID-19, current data on central nervous system involvement are uncommon but growing (9-17), demonstrating the high frequency of neurologic symptoms. However, the delineation of a large cohort of confirmed brain MRI parenchymal signal abnormalities (excluding ischemic infarcts) related to COVID-19 has never been performed, and the underlying pathophysiologic mechanisms remain unknown. The purpose of the current study was to describe the neuroimaging findings (excluding ischemic infarcts) in patients with severe COVID-19 and report the clinicobiologic profile of these patients. Materials and Methods This retrospective observational national multicenter study was initiated by the French Society of Neuroradiology in collaboration with neurologists, intensivists, and infectious disease specialists and brought together 16 hospitals. The study was approved by the ethical committee of Strasbourg University Hospital (CE-2020-37) and was in accordance with the 1964 Helsinki Declaration and its later amendments. Because of the emergency in the context of the COVID-19 pandemic responsible for

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Purpose To determine the impact of the COVID-19 on the CT activities in French radiological centers during the epidemic peak. Materials and methods A cross-sectional prospective CT scan survey was conducted between March 16 and April 12, 2020, in accordance with the local IRB. Seven hundred nine radiology centers were invited to participate in a weekly online survey. Numbers of CT examinations related to COVID-19 including at least chest (CT covid) and whole chest CT scan activities (CT chest) were recorded each week. A sub-analysis on French departments was performed during the 4 weeks of the study. The impact of the number of RT-PCRs (reverse transcriptase polymerase chain reactions) on the CT workflow was tested using two-sample t test and Pearson's test. Results Five hundred seventy-seven structures finally registered (78%) with mean response numbers of 336 ± 18.9 (323; 351). Mean CT chest activity per radiologic structure ranged from 75.8 ± 133 (0-1444) on week 12 to 99.3 ± 138.6 (0-1147) on week 13. Mean ratio of CT covid on CT chest varied from 0.36 to 0.59 on week 12 and week 14 respectively. There was a significant relationship between the number of RT-PCR performed and the number of CT covid (r = 0.73, p = 3.10 −16) but no link with the number of positive RT-PCR results. Conclusion In case of local high density COVID-19, CT workflow is strongly modified and redirected to the management of these specific patients. Key Points • Over the 4-week survey period, 117,686 chest CT (CT total) were performed among the responding centers, including 61,784 (52%) CT performed for COVID-19 (CT covid). • Across the country, the ratio CT covid /CT total varied from 0.36 to 0.59 and depended significantly on the local epidemic density (p = 0.003). • In clinical practice, in a context of growing epidemic, in France, chest CT was used as a surrogate to RT-PCR for patient triage.

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Introduction: ince the outbreak of the COVID-19 pandemic , increasing suggests that infected patients present a high incidence of venous thromboembolic events (VTE). The main objective of this retrospective study was to evaluate the prevalence of acute pulmonary embolism (PE) on pulmonary computer tomography angiograms (CTPA) in patients classified as COVID-19 infection. The second objective was to determine if there is a link between D-dimer levels, serum C-reactive protein (CRP ), body mass index (BMI) , the lung parenchyma lesions (LPL) and acute pulmonary embolism (PE) in these patients. Material and Methods: 120 patients with mean age 65 ±14.5 years infected with COVID- 19 underwent in our institution a CTPA for suspected PE .Thirty four were in intensive care units (ICU). A COVID-19 diagnosis was made by transcriptase polymerase chain reaction by means of nasopharyngeal swab or by chest CT images. Demographics and co-morbidities characteristics were collected . Laboratory parameters were automatically extracted from our heath information system. When PE was suspected a CTPA were acquired after injection of high concentration iodine contrast media .The criterion of suspected PE were based on the clinical respiratory deterioration , with an increased need for oxygen. A venous duplex ultrasound (DU) test of lower limbs was performed on admission. Results: CTPA showed 24 acute PE (20%) , of which 11 primary and 13 associated with deep venous thrombosis diagnosed on DU .Eleven of the 24 (45.8 %)had PE despite preventive and therapeutic anticoagulation with low molecular weight heparin with Enoxaparin (7 with preventive anticoagulation and 4 had therapeutic dose), of them 8 (72.7%) with risk factors for VTE .Acute PE was not significantly associated with CRP and LPL. However , we found a significant association between acute PE and BMI (mean 32.41±5.90 versus 27.1± 5.2 kg/m2, p 0.0007) or D-dimer Levels (mean 6040±5068 versus 3396.7±5361.5 ng/ml ,p <0.0001). Conclusions: Hospitalized patients infected with COVID-19 in conventional units or ICU have a high frequency of PE justifying preventive anticoagulation. For those who have a risk factors for VTE a therapeutic anticoagulation may be indicated.