A Case of Non-Bacterial Thrombotic Endocarditis with Atypical Massive Vegitation

Takanobu Kimura＊	Takuki Wada＊	Shuji Setozaki＊
Hideyuki Katayama＊	Shuntaro Shimomura＊	Hiroshi Tsuneyoshi＊

(Department of Cardiovascular Surgery, Shizuoka Prefecture General Hospital＊, Shizuoka, Japan)

The patient was a 68-year-old woman. She was diagnosed with uterine cancer after experiencing irregular genital bleeding. Contrast-enhanced computed tomography showed a 30 mm left ventricular mass and splenic infarction, and head MRI showed multiple cerebral infarctions. The patient was suffering from systemic embolism caused by the cardiac mass, and we decided to perform cardiac mass removal prior to uterine cancer treatment. A yellowish-white thrombus-like mass attached to the mitral valve, subvalvular tissue, and left ventricular endocardium was removed by a trans-septal approach under cardiopulmonary bypass. Pathological examination revealed that the mass was a fibrin-based thrombus with almost no inflammatory findings, we diagnosised non-bacterial thrombotic endocarditis（NBTE）. Postoperatively, the patient developed Takotsubo cardiomyopathy, and treatment for uterine cancer, was delayed. Hypercoagulability was not controlled well, and she developed recurrence of left ventricle vegitation, acute arterial occlusion of the lower extremities and inferior vena cava thrombosis, making active intervention for uterine cancer difficult. The patient was treated palliatively and died on POD 36. NBTE tends to be characterized by multiple small growths, but giant vegetation may also occur as in this case. Unless the primary disease causing the hypercoagulability is treated, recurrence of NBTE is possible, and prompt treatment of the primary disease is required.

 

Jpn. J. Cardiovasc. Surg. 51: 231-234 （2022）

Keywords：non-bacterial endocarditis; Trousseau syndrome; cardiac tumor; infective endocarditis; uterine cancer