INTRODUCTION
Sinus-venous atrial septal defect (ASD) is an uncommon type of ASD, accounting for 5-10% of ASD cases [1]. Partial anomalous pulmonary venous connection (PAPVC) is also a rare congenital anomaly that occurs in 0.4-0.7% of the population, as reported by histopathological specimens, and can lead to a volume overload to the right heart as some pulmonary veins return to the venous system. Approximately 10% of ASDs are associated with PAPVC [1, 2]. According to some reports, superior sinus-venosus ASD is difficult to visualize using transthoracic echocardiography (TTE), including in combination with other cardiac imaging modalities[3-5]. There have been few reports about the technical method for delineating superior type of sinus-venosus ASD in TTE. In this case, it was possible to show sinus-venosus ASD complicated by PAPVC clearly. Consequently, we believe, their anatomical characteristics and how it was drawn by TTE is very informative.