1 ) , the stenosis was classified according to the Stanford classification [ 7 ] system into 4 types : ( i ) type I describes a partial obstruction of the SVC ( up to 90 % ) with remaining patency and antegrade perfusion of the azygos vein ; ( ii ) type II shows increasing obstruction ( 90-100 % ) ; ( iii ) type III is complete obstruction with ...
The tulip tree is a deciduous tree with a moderate to rapid growth rate. It has a tendency to produce a strong central leader that forms a tall, straight trunk. When young, this tree tends to have a canopy with an upright pyramidal growth habit, As it ages, the tree becomes columnar or more spreading and open.
The tulip tree is one of the largest of the native trees of the eastern United States, known to reach the height of 60 m (190 ft), with a trunk 3 m (10 ft) in diameter; its ordinary height is 20 to 30 m (70 to 100 ft). It prefers deep, rich, and rather moist soil; it is common, though not abundant, nor is it solitary.