Purpose: The novel 2019 coronavirus disease is causing the current epidemic of pneumonia in Japan. This report evaluates contrast-enhanced computed tomography (CECT) features affecting clinical worsening in patients with non-severe pneumonia. Methods: Clinical data of 11 patients hospitalized at our institution due to non-severe COVID-19 pneumonia between April 1 and April 30, 2020, were analyzed retrospectively. Results: One patient (9.1%) deteriorated, and 10 patients (90.9%) improved and/or

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... tabilized. CECT was performed on three patients with D-dimer elevated to >6-fold above the upper limit of normal. No patients suffered pulmonary embolism (PE). Heparin treatment was administered for 3 patients with elevated D-dimer levels, and the one patient with the sign of a RV/LV ratio of > 1.0 on CECT underwent intubation and respiratory management. Conclusion: A sign of RV dilatation without PE on CECT may be useful for predicting rapid clinical worsening and appropriate management in patients with non-severe COVID-19 pneumonia.