福原 正博¹, 許 美千代¹, 小山 治¹, 大西 一男¹, 日並 史成¹, 斉藤 清治¹, 足立 和彦¹, 種本 基一郎¹, 吉栖 正之²

Masahiro FUKUHARA¹, Michiyo KYO¹, Osamu KOYAMA¹, Kazuo ONISHI¹, Fumishige HlNAMI¹, Kiyoharu SAITO¹, Kazuhiko ADACHI¹, Kiichiro TANEMOTO¹, Masayuki YOSHIZUMI²

¹神戸労災病院内科, ²神戸中央市民病院循環器センター外科

¹Department of Internal Medicine, Kobe Rosai Hospital, ²Department of Cardiac Surgery, Kobe Municipal Central Hospital

キーワード : left atrial aneurysm, intrapericardial wall type, echocardiography, computed tomography, angiography

Echocardiographic findings of the left atrial aneurysm of the intrapericardial wall type were described. The M-mode echocardiography obtained by standard technique showed no abnormality.
Short axis M-mode scan at the level of the aortic valve revealed the left atrial cavity continuing into a large lateral echo free space.
Esophageal approach showed the lateral echo free space clearly but could not detect the communication between the left atrial cavity and the lateral echo free space.
Cross sectional echocardiography also showed an abnormal echo free cavity lateral to the left atrium and the left ventricle.
Short axis cross sectional echogram at the level of the aortic valve demonstrated the ostium of the abnormal echo free cavity.
Short axis cross sectional echogram at the level of the mitral valve represented the pericardial echo behind the left ventricular posterior wall continuing to the posterior wall of the abnormal echo free cavity.
It was considered that these echocardiographic findings are characteristic of the left atrial aneurysm of the intrapericardial type.
Echocardiographic examination is useful technique for preoperative diagnosis and classification of left atrial aneurysm.