Research Article Volume 6 • Issue 1 41 Chest CT Scan In Patients With Contusion and COVID-19, A Comparative Study With Pure Lung Contusion Amin Sadraei M.D. 1 , Seyed Hamed Jafari M.D. 2 , Seyed Mehdi Shahnematollahi M.D. 3 Mohammadamir Taherinezhad M.D. 4 , Nazanin Sadraei M.D. 5* , Zahra Hooshanginezhad M.D. 6 Afliation: 1 Shiraz Nephro-Urology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran 2 Associated professor of radiology, Shiraz University of Medical Science. Medical Imaging Research Center, Shiraz University of Medical Sciences, Shiraz, Iran 3 School of medicine, Shiraz University of Medical Science, Shiraz, Iran 4 Cardiology resident, School of Medicine, Department of cardiology, Shiraz University of Medical Sciences, Shiraz, Iran 5 Medical Imaging Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. 6 Shiraz University of Medical Sciences, Shiraz, Iran Corresponding author: Nazanin Sadraei M.D., Email: na.sadraei@gmail.com Citation: Amin Sadraei M.D., Seyed Hamed Jafari M.D., Seyed Mehdi Shahnematollahi M.D. Mohammadamir Taherinezhad M.D., Nazanin Sadraei M.D., Zahra Hooshanginezhad M.D. Chest CT scan in patients with contusion and COVID-19, a comparative study with pure lung contusion. Journal of Radiology and Clinical Imaging. 6 (2023): 41-47. Received: February 10, 2023 Accepted: February 20, 2023 Published: March 16, 2023 Abstract Resource allocation for traumatic patients who are positive/negative for COVID-19 challenges the diagnosis. This study aims to compare the chest CT of COVID-19 associated with lung contusion versus those with lung contusion only. CT-scans of 9 RT-PCR positive patients with lung contusion due to MVA (CC group) and 16 patients with lung contusions from pre-COVID-19 (CO group) were revaluated. The distribution and characteristics of presenting CT-scan fndings; including presence, shape, distribution of GGO, consolidations, subpleural sparing, crazy-paving and Atoll sign. Presence of efusions and cavities were compared. Time course of the opacities was compared. Bilateral distribution of opacities was noted in 100% of CC and 87.5% of CO group. There was no signifcant diference between GGO or consolidation shapes (P=0.44 and P=0.66). Both GGO and consolidations were more difusely distributed in CC, a predominantly peripheral distribution was more commonly seen in the CO group (P=0.03 and P=0.01). Subpleural sparing was noted in 93.8% of CO as compared to 44% of CC group (p=0.04). Time to resolution was signifcantly longer in CC (15±6days) comparing to CO patients (P=0.02). 'Typical' chest CT fndings including bilateral peripheral GGO and consolidations, crazy- paving, Atoll signs and also less typical fndings e.g. subpleural sparing is seen in lung contusion and COVID-19 pneumonitis. Lesion Time course might be a better radiologic discriminator between the two entities. Keywords: COVID-19; lung contusion; Chest CT scan; RT-PCR Introduction New coronavirus disease (COVID-19) is one of the most recent catastrophes of modern-day human history. First case of COVID-19 emerged in December 2019 in the city of Wuhan located in Hubei province in China, with drastic increase in number of cases of a severe respiratory disease [1]. This contagious virus spread rapidly around the globe. During this pandemic, Iran was not an exception as the frst positive case was formally reported on February 1st, 2020[2]. At the time of this investigation Iran ranked the fourteenth country in prevalence and ninth country in the number of deceased cases. Besides, Iran is ranked as the ffth country in trafc accidents with prevalence about twenty times higher than the global average [3]. Thoracic injury is the third common injuries after head and extremities. Patients with COVID-19 classically present with symptoms such as fever (98%), cough (76%), dyspnea (55%) and myalgia or fatigue (44%), and less commonly with symptoms such as productive cough and rarely hemoptysis