[Missing Floating Mass in the Ascending Aorta;Report of a Case].

A 65-year-old man, with a history of hypertension, presented with dizziness and emesis and was admitted to a local hospital. He was a moderate smoker, but he did not take any hormone-based medication. Magnetic resonance imaging showed scattered cerebral infarction in the bilateral cerebral hemisphere and right cerebellar hemisphere. There were no abnormal findings in Holter monitor and echography of heart, carotid artery, and leg vein and then, antiplatelet therapy was initiated. After that, both computed tomography and magnetic resonance imaging demonstrated a floating pedunculated mass in the ascending aorta measuring 10×8×14 mm. He was admitted to our hospital 15 days after the symptom onset. Laboratory tests including immunological and coagulation studies were within normal. Computed tomography showed on the second day of the admission that the mass spontaneously disappeared, thus canceling the schedule of surgery. He received an oral anticoagulant and discharged uneventfully. During a follow-up period of 6 months, there is no recurrence of the thrombus in the aorta and thromboembolic events.