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.
Causes of superior vena cava syndrome. SVCS is more common for people who have lung cancer, non-Hodgkin lymphoma, or cancers that spread to the chest. But cancer can cause SVCS in other ways: A tumor in the chest may press on the superior vena cava. A tumor may grow into the superior vena cava, causing a blockage.