Assertion: mediastinum's thymus | /r/HasProperty | may atrophy
Facets:
Source sentences:
text: Because there are thymus (may atrophy), left and right brachiocephalic veins and superior vena cava in the front, aortic arch and its three branches (phrenic nerve and vagus nerve have smaller resistance) in the middle left of retrosternal space, tumor growth will be resisted there.