消えた上行大動脈内腫瘤の1例

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

はじめに　心臓腫瘍には乳頭筋線維腫，粘液腫，横紋筋腫などの良性腫瘍や血管肉腫，横紋筋肉腫，平滑筋肉腫などの悪性腫瘍，転移性腫瘍などがあり，比較的発生頻度は高い．一方，大動脈内腫瘍，特に上行大動脈内腫瘍はまれな疾患であり，塞栓症を契機に発見されている症例もある1）．

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.