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The SARS-Cov-2 pandemic took health care players across the world by surprise, including caregivers, managers and logisticians. In the absence of a vaccine or a specific therapy, detecting the disease at an early stage and isolating confirmed cases from the rest of the healthy population was soon considered to be essential. The RT-PCR technique was the gold standard method for testing for infection with the virus. It has high specificity but moderate sensitivity. It was difficult to access it during the first weeks of the pandemic. On the basis of the observations of the Chinese and Italian scientific community in particular, the recommendation was to combine use of the RT-PCR with a low-dose thoracic CT scan. In the absence of easy access to the RT-PCR, the use of the lung CT scan for a rapid triage of patients within emergency departments proved effective., (Copyright © 2020 Elsevier Masson SAS. All rights reserved.)

La maladie à coronavirus 2019 (COVID-19) déclarée en Chine en fin 2019 s´est rapidement généralisée aux autres continents. Son diagnostic se fait par test PCR (Polymerase Chain Reaction) sur des prélèvements naso-pharyngés. Ce test bien que spécifique est d´une sensibilité moindre comparé à la TDM thoracique. Nous rapportons le cas d´un patient testé négatif à deux reprises et chez qui la TDM retrouvait des signes typiques de COVID-19 et une embolie pulmonaire. Et ce n´est qu´après un troisième test PCR qu´il a été positif. Ce qui montre l´intérêt de répéter plusieurs fois les tests PCR mais également de considérer les signes scanographiques comme argument diagnostic devant induire une prise en charge adéquate., Competing Interests: Les auteurs ne déclarent aucun conflit d´intérêts., (© Ibrahima Niang et al.)

The term «crazy paving» describes an unspecific pattern in thoracic computed-tomography mimicking a paving stone configuration. This pattern can be caused by a number of differential diagnosis, for example alveolar hemorrhage, alveolar proteinosis, lipoid pneumonia or adenocarcinoma in situ. The knowledge of the correlation between imaging findings, histopathological pattern and clinical presentation prepares the clinician to understand the pathophysiology and to initiate the right therapeutic processes. In the following review, we describe the most common diseases and their radiologic correlation in daily practice.