The internal thoracic lymph nodes,which drain the inner half of the breast,can also be a channel for the:

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Lymph drainage generally follows the course of the vessels.Greater than 75% of lymph drainage,chiefly from the lateral quadrants,drains to the axillary lymph nodes.The remainder of lymph drains to either the parasternal nodes,the opposite breast (medial quadrants),or the inferior phrenic nodes' lower quadrants.The internal thoracic nodes are few but are responsible for most lymph drainage from the inner half of the breast.Thus,the lymph system can also be a channel for the spread of malignant disease from the breast to associated areas of the chest wall or to the axilla.

The Internal Thoracic Lymph Nodes,which Drain the Inner Half of the Breast,can