僧帽弁形成術および三尖弁輪形成術後に特異な右房内血栓を形成した1例

Pedunculated and Mobile Right Atrial Thrombus Moderately after Mitral Valve Plasty and Tricuspid Valve Annuloplasty：Report of a Case

はじめに　右房内腫瘤の鑑別として，腫瘍，血栓，疣贅などが報告されている1）．われわれは，僧帽弁形成術および三尖弁輪形成術後に短期間で発生した右房内腫瘤を外科的に摘出し，これが特異な形態をした血栓であったので報告する．

An 81-year-old female underwent mitral valve plasty and tricuspid annuloplasty using an artificial annulus for mitral valve insufficiency and secondary tricuspid valve insufficiency at our hospital. Echocardiography 5 months later showed no abnormal finding. Eight months after the operation, however, a pedunculated and highly mobile mass in the right atrium was found, and the patient was admitted to our hospital. Its shape was really uncommon, and it was difficult to differentiate between a thrombus and a tumor. We subsequently performed a surgical removal. The resected mass was filled with many star-shaped spherical tissues which were partially organized white thrombi histologically. Damage to the right atrial endocardium during previous surgery could be the cause.