中山 浩二¹, 寺柿 政和², 渡辺 弘之², 坂元 一夫¹, 戸田 為久², 秋岡 要², 生野 善康¹, 末広 茂文³, 竹内 一秀², 吉川 純一²

Koji NAKAYAMA¹, Masakazu TERAGAKI², Hiroyuki WATANABE², Kazuo SAKAMOTO¹, Iku TODA², Kaname AKIOKA², Yoshiyasu IKUNO¹, Shigefumi SUEHIRO³, Kazuhide TAKEUCHI², Junichi YOSHIKAWA²

¹多根総合病院内科, ²大阪市立大学第1内科, ³大阪市立大学第2外科

¹Department of Internal Medicine, Tane General Hospital, ²First Department of Internal Medicine, Osaka City University, ³Second Department of Surgery, Osaka City University

キーワード : Echocardiography, Primary cardiac tumor, Recurrence, Synovial sarcoma

Synovial sarcoma is a very rare primary tumor of the heart. Only six cases have been reported. Here we report an additional case, that of a 29-year-old man who complained of a dry cough. A chest x-ray revealed cardiomegaly. Transthoracic and transesophageal echocardiogrms showed a less mobile homogenous tumor that occupied most of the left atrial cavity and caused the hemodynamic consequence of mitral valvular stenosis. A hard elastic mass was found arising from the posterior wall of the left atrium on surgery. Microscopically, the tumor was diagnosed as a synovial sarcoma with a biphasic growth pattern. Metastases were not found. During the echocardiographic follow-up the tumor grew rapidly in the left atrium, but with no clinical manifestations. We considered it to be a recurrence.