en Infectious Diseases Infectious Diseases Case Series Case Series <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="color:#0000ff;"><em><strong>Background:</strong></em></span> Coronavirus disease 2019 (COVID-19) has rapidly emerged as a threatening pandemic. Clinical features of this pandemic involve a wide range of manifestations and are not completely known. Here, we present six cases of thrombotic events in patients with COVID-19.<br> <span style="color:#0000ff;"><em><strong>Case presentation:</strong></em></span> In this case series, we present six patients with confirmed COVID-19, according to real-time polymerase chain reaction, who were referred to our emergency department and were found to have thrombotic events. Pulmonary thromboembolism was diagnosed in three patients by computed tomography (CT) angiography. One patient was found to have deep vein thrombosis in Doppler ultrasonography. Another patient who presented with loss of consciousness, was finally diagnosed with cerebrovascular accident using brain CT. One of the patients had developed a myocardial infarction that was evident in the electrocardiography.<br> <span style="color:#0000ff;"><em><strong>Conclusion: </strong></em></span>It is ostensible that COVID-19 puts the patients at an increased risk for developing thrombotic conditions, possibly through formation of hyper-inflammatory and hyper-coagulative states. However, further prospective studies are recommended to confirm these findings.</span></span> Coronavirus Disease 2019, Thrombosis, Myocardial Infarction, Pulmonary Thromboembolism, Venous Thrombosis 551 556 http://caspjim.com/browse.php?a_code=A-10-1817-2&slc_lang=en&sid=1 Zahra Javidarabshahi javidaz@mums.ac.ir 100319475328460026249 100319475328460026249 No Lung Diseases Research Center, Mashhad University of Medical Science, Mashhad, Iran Shohre Khatami khatamish@mums.ac.ir 100319475328460026250 100319475328460026250 No Department of Internal Medicine, Mashhad University of Medical Science, Mashhad, Iran Roxana Rezazade rezazadehr971@mums.ac.ir 100319475328460026251 100319475328460026251 No Department of Internal Medicine, Mashhad University of Medical Science, Mashhad, Iran Neda Saeedian saeediann971@mums.ac.ir 100319475328460026252 100319475328460026252 No Department of Internal Medicine, Mashhad University of Medical Science, Mashhad, Iran Mahnaz Mozdourian mozdorianmh@mums.ac.ir 100319475328460026253 100319475328460026253 Yes Lung Diseases Research Center, Mashhad University of Medical Science, Mashhad, Iran