1 Gently rub a pumice stone back and forth across the affected area for three to five minutes and then pat dry your feet. 2  Dip a cotton ball in castor oil and place it on the corn. Secure it with tape and leave it on overnight.  The next morning, remove the bandage and apply castor oil several times a day.
1. I am confused regarding the presence of valves in the superior vena cava. The superior vena cava does not possess valves unlike inferior vena cava, which possesses Eustachian Valve.
Most superior vena cava syndrome cases are attributed to cancer, with the most common causes being lung cancer and non-Hodgkin lymphoma. A rare cause of superior vena cava syndrome is an infection of the mediastinum (in the chest), which causes thickening and hardness of the mediastinal tissues.