1The First Department of Iiternal Medicine, Tottori University School of Medicine, 2The Second Department of Surgery, Tottori University School of Medicine
Cor triatrum, Color Doppler echocardiography, Transesophageal two-dimensional echocardiography, Inflow signal
A 45-year-old female with cor triatriatum was reported with special reference to the inflow signals passing from the accessory chamber to the left atrium using color Doppler echocardiography. Transthoracic and transesophageal 2-dimensional echocardiography (2-D echo) revealed a bright, echodense septum between the inter-atrial septum and the left atrial wall. However, a fenestration within this abnormal septum could not be visualized by 2-D echo. Transthoracic color Doppler echocardiography showed only the one inflow signal in short axis view, but transesophageal color Doppler echocardiography showed the two inflow signals. During surgery we found a spiral-shaped septum originating from the posterior wall of the left atrium and no fenestration within the septum. A fenestration of about 1 cm in diameter was composed of the abnormal septum and the posterior wall of the left atrium. The three inflow signals detected by color Doppler echocardiography were believed to show the abnormal intra-atrial hemodynamic patterns caused by the complex structure of the left atrium. Transesophageal 2-D echo color Doppler echocardiography proved to be useful in detecting the complex structures and the hemodynamic patterns in our case of cor triatriatum.