A 57-year-old man with hypertension presented to our emergency center for chest discomfort. He had undergone chest computed tomography (CT) in another hospital 4 hours prior for evaluation of a solitary pulmonary nodule. Initial vital signs were 154/84 mmHg and 62 beats/min. Electrocardiography, chest radiography, and laboratory test results including arterial blood gas analysis were within the normal ranges. However, large volumes of air in the right atrium, right ventricle, and both main pulmonary arteries were noted in post-contrast phase of chest CT performed in the previous hospital (Fig. 1A-1F, black arrowheads). The patient complained of only mild chest discomfort but no dyspnea. Cardiac CT was followed for evaluation of the residual air and it revealed no evidence of air in the heart or pulmonary circulation 4 hours later (Fig. 1G-1I). Conclusively, intracardiac air embolism was completely resolved, and the patient spontaneously recovered without any complication.