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.
Tulip Poplar - Liriodendron tulipifera. Magnolia Family (Magnoliaceae) The tulip poplar (also called tulip tree) is actually more closely related to magnolia than either a tulip or a poplar. The reference to tulips comes from the shape of the greenish yellow and orange flowers. Tulip poplar is currently the state tree of Kentucky.