Fig. 3

Images of the intrathymic LBCV using two-dimensional (2D) and three-dimensional ultrasonography. A 2D ultrasound image showing intrathymic LBCV. B Color Doppler blood flow demonstrating intrathymic LBCV. C-D HD-flow render mode and spatiotemporal image correlation showing that the LBCV passes through the thymus. E–F Postpartum 2D and color Doppler ultrasound images showing that the LBCV runs in the thymus, which demonstrates good consistency with the prenatal ultrasound image. G-H Structural presentation of intrathymic LBCV. G Anterior view. H Superior view. AO, aorta; PA, pulmonary artery; SVC, superior vena cava; DA, ductus arteriosus; AzV, azygos vein; DAO, descending aorta; LBCV, left brachiocephalic vein; Th, thymus; LSA, left subclavian artery; RBCV, right brachiocephalic vein; L, left; R, right; A, abdominal; P, spinal; Ce, cephalic; Ca, caudal