has part has part has_part characteristic of has modifier abnormal azygos vein morphology abnormal azygos vein topology MP:0013858 abnormal position(s) of the unpaired vein which in humans arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava; unlike humans, mice have a single and left-sided azygos vein that develops from the paired embryonic cardinal venous system and drains most of the right and left thoracic walls into the left anterior vena cava abnormal vena azygos topology position abnormal azygos vein