thrombus is either at the entry of the renal vein or within the inferior vena cava (IVC) < 2 cm from the confluence of the renal vein and the IVC. Level II: Thrombus extends within the IVC > 2 cm above the confluence of the renal vein and IVC but still remains below the hepatic veins. Level III: Thrombus involves the intrahepatic IVC. The size of the thrombus ranges from a narrow tail that extends into the IVC to one that fills the lumen and enlarges the IVC.
What are three main types of rockets that power modern spacecrafts? The three kinds of rockets are solid fuel rockets, liquid fuel rockets, and ion powered rockets. Edit
When the fuel of the second stage has been expended, the third-stage engine cuts in and the second stage is jettisoned. This process could, in theory, be continued further, but structural complexity imposes a practical limit on a multistage rocket of two to four stages.ultistage rockets may be constructed with the stages in a series or a parallel arrangement. In a series, or tandem combination, which is the most common, each individual stage is first exhausted and then jettisoned, whereupon the engine of the next stage is ignited.