The child, a female, 2 weeks old, was seen in the outpatient clinic. The patient’s family reported that the child had recently had persistent high fever and cough. A systolic murmur was present on auscultation. On echocardiography, she was diagnosed with congenital heart disease – ventricular septal defect (subcristal type), left heart enlargement, right ventricular outflow tract obstruction, pulmonary artery stenosis, right ventricular wall hypertrophy, and strip-like superfluous formation in the right ventricular outflow tract was also detected. Infective endocarditis (SBE) is highly prevalent in children with precordial disease and has an echocardiographic sensitivity of up to 90% and is an important basis for the decision to operate. Secondary IE should be considered in children with persistent high fever, chills, anemia, hepatosplenomegaly, and positive blood cultures. In suspected patients, repeated echocardiography should be performed to improve the detection rate of superfluous organisms. Feng Tianying, Department of Ultrasound Medicine, People’s Hospital of Inner Mongolia Autonomous Region