Can systemic venous congestion caused by tumor? I am thinking, if 1) little compressed superior caval vena and 2) some vein compression by tumor, can cause systemic venous congestion. I think this is only in rare occasions. However, the question is if this is possible. **Can systemic venous congestion caused by these two factors?**

No. They increase the risk, but are not the causes. There must be other factors involved which triggers the systemic venous congestion.