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A preterm infant with birth weight 1,550 g had an intravenous foreign body between the external iliac vein and the common iliac vein, which accidentally happened during peripheral intravascular central catheter insertion by the Seldinger technique. The infant initially received conservative management and close monitoring. Antibiotics were administered 4 weeks to treat culture positive sepsis and meningitis. The infant was clinically stable till the cannula fragment migrated to the heart 34 days later. At that time, his weight was 2,200 g, and he was full fed. The cannula fragment was retrieved by emergency interventional radiology via the right femoral access, with no complications. The infant was discharged at 45 days of age and closely followed up post-discharge. He is currently 6 months old, with normal development. This is the first case of successful percutaneous retrieval of an intracardiac intravenous cannula fragment via femoral access in a premature infant in China. [ABSTRACT FROM AUTHOR]