https://www.selleckchem.com/products/mgh-cp1.html The difficulty of correcting nasal septum deformities using the classical Killian or Cottle techniques or derivatives has led in recent years to new suggestions such as extracorporeal septoplasty or various apposition grafts to counteract refractory deformity of the quadrangular cartilage. Naturally occurring septal deformities result from conflicts in growth between the quadrangular cartilage, perpendicular ethmoidal plate and vomer, which each have their own different evo-devo origin. Septoplasty by disarticulation consistently restores a level septum by completely resolving the growth conflicts. Conserving the quadrangular cartilage is essential for the stability of the nasal pyramid on condition that 1) the lateral flare of the superior edge of both the component septolateral cartilages that suspend it at the roof of the piriform orifice and 2) the height of its anterior edge are respected. The anterior edge is always high enough (except in case of fracture or malformation to project the retrolobular nasal dorsum in proportion to the height of the alar cartilage when it is repositioned on its natural premaxillary base. Real-time polymerase chain reaction (RT-PCR) remains the gold standard for confirmation of Coronavirus Disease 2019 (COVID-19) despite having many disadvantages. Here, we investigated the diagnostic performance of chest computed tomography (CT) as an alternative to RT-PCR in patients with clinical suspicion of COVID-19 infection. In this descriptive cross-sectional study, 27,824 patients with clinical suspicion of COVID-19 infection who underwent unenhanced low-dose chest CT from 20 February, 2020 to 21 May, 2020 were evaluated. Patients were recruited from seven specifically designated hospitals for patients with COVID-19 infection affiliated to Shahid Beheshti University of Medical Sciences. In each hospital, images were interpreted by two independent radiologists. CT findings were considered as