We report a case about an 81 year old healthy woman who has no past medical history. She consulted a nearby doctor due to bilateral lower-extremity edema which appeared one month ago. Thoracic echocardiography revealed a moderate to severe tricuspid valve regurgitation (TR), and she consulted our hospital. There were no subjective symptoms, however, systolic murmur was present. Moreover, jugular vein distention was present, and, imaging diagnosis revealed the enlargement of inferior vena cava. Thus, we diagnosed as right heart failure (HF). In echocardiography, no abnormal findings in left heart structure were observed. On the other hand, a tumor of 34 × 16 mm in size was revealed in the main pulmonary artery (mPA). The mPA was almost occupied by a tumor, and the flow velocity of the pulmonary artery had been accelerated to 4 m/sec. Even with contrast computed tomography, a tumor almost occupied the mPA. Therefore, we performed a tumor extirpation to prevent sudden death and improve right HF. TR was alleviated and right HF disappeared at postoperative. A pulmonary artery tumor is extremely rare, and there are even few cases found through the diagnoses of right HF.
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