僧帽弁口に陥頓する囊胞を形成した左房粘液腫の1例

Cystic Myxoma which Obstructed the Mitral Valve Orifice；Report of a Case

はじめに　粘液腫は心臓良性腫瘍の約半数を占めるもっとも頻度の高い腫瘍であり，特徴的なエコー像を示すが，囊胞性変化や石灰化などの非特異的所見を呈する場合がある．われわれは，囊胞が主体となって僧帽弁に陥頓し，診断に難渋した左房粘液腫の1例を経験したので報告する．

A 44-year-old male presented to our hospital with exertional dyspnea. Transthoracic echocardiography revealed a large cystic mass in the left atrium obstructing the mitral valve orifice. Transesophageal echocardiography during emergency operation showed a large cystic mass along with a solid part near the stalk. The mass was resected en bloc including the margin of the left atrium around the stalk. His hemodynamics improved immediately after the operation and the patient was discharged shortly with uneventful postoperative course. While intra cardiac cystic mass has some possible pathologies including malignancy, pathological examination of this tumor revealed a myxoma with large hematoma which had probably grown up rapidly. This tumor was successfully eradicated under the guide of both transthoracic and transesophageal echocardiography.