Thoracic Duct

The Thoracic Duct is the largest lymphatic vessel in the body. It originates from the union of dilated lumbar lymph trunks. Superior to the diaphragm the left half of the body drains to the thoracic duct. Inferior to the diaphragm, all lymph drains to the thoracic duct.

Lacerations of the thoracic duct result in lymph escaping into the thoracic cavity. Lymph (chyle) may enter the pleural cavity producing chylothorax.