患儿男,1个月。因“感冒”就诊。听诊心脏有杂音,经胸超声心动图示右心房内、下腔静脉开口上方一大小约26 mm×25 mm×22 mm软组织回声,内部回声尚均匀,肿块占据右心房的3/5,下腔静脉血流无异常(图1)。CT示右房内约20 mm×15 mm×31 mm大小占位,形态较规则,边界清晰,密度均匀,C Children male, 1 month. Due to “cold” treatment. Auscultation heart murmur, transthoracic echocardiography right atrium, superior vena cava opening above a size of about 26 mm × 25 mm × 22 mm soft tissue echo, the internal echo is uniform, the tumor occupies the right atrium of 3/5, the lower chamber No abnormal venous flow (Figure 1). CT showed about 20 mm × 15 mm × 31 mm size of the right room to occupy the seat, the shape of a more regular, clear boundary, uniform density, C