abnormal lymphatic vessel morphology abnormal thoracic duct morphology MP:0004107 MPheno.ontology abnormal Pecquet duct morphology abnormal Van Hoorne's canal morphology abnormal alimentary duct morphology abnormal chyliferous duct morphology abnormal ductus thoracicus morphology abnormal left lymphatic duct morphology abnormal van Horne canal morphology any structural anomaly in the largest collecting lymph vessel in the body, beginning at the cisterna chyli at about the level of the second lumbar vertebra, and drains into the systemic (blood) circulation at the left brachiocephalic vein between the left subclavian and left internal jugular veins