Results 
Among the 109 RT-PCR positive patients, there were higher rates of bronchial distortion and total volume lung involvement ≥ 50% in the dead, IEV and ICUH groups (p < 10-3). Vascular dilatation and a number of involved lobes ≥ 4 were associated with IEV and ICUH (p < 10-3).
Among the 349 patients, sensitivity, specificity, positive and negative predictive values of chest CT versus RT-PCR were respectively 93,6 % [95% CI 89-98,2], 85,8 % [81,4-90,2], 75 % [67,7-82,3], and 96,7 % [94,3-99,1].
Unlike previous studies, we found different kinds of CT signs patterns, rather than a stereotyped COVID-19 pneumonia pattern. Maximal lesion expansion was observed during the second week after the first symptoms.
ConclusionBronchial distorsion and lesion expansion seem to be correlated with death in COVID-19 patients. This study confirms chest CT major diagnostic value.
Keywords  : COVID-19, chest CT, invasive endotracheal ventilation, bronchial distortion, critical care.