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Mediastinal lymphadenopathy is rare in Coronavirus Disease-2019 (COVID-19) patients with mild clinical course. The frequency of lymphadenopathy increases in COVID-19 patients who develop Acute Respiratory Distress Syndrome (ARDS). In a 38-year-old male patient, mediastinal lymphadenopathy and asymptomatic pulmonary embolism were detected during the third week of COVID-19 infection at home. Sarcoidosis was diagnosed with a finding of non-caseating granulomas. Even if it is asymptomatic, pulmonary embolism should be considered, especially in COVID-19 patients with high C - Reactive Protein (CRP) and D-dimer levels. If mediastinal lymphadenopathy is detected in mild COVID-19 cases, systemic diseases should be investigated. In severe COVID-19 cases, if lymphadenopathy continues despite a COVID-19 recovery, further investigation is required.