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internal thoracic artery, internal thoracic vein - left
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This image shows the interior surface of the breastplate, facing the heart and lungs.
yellow pin = internal thoracic artery
blue pin = internal thoracic vein

About 25% of the lymph from the breast drains to the parasternal nodes (aka internal mammary or internal thoracic nodes) located along the internal thoracic vessels deep to the costal cartilages and intercostal spaces - thus, breast cancer has the potential to spread to these nodes.
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