You can find a lot of research on this diagnosis. First of all, I'm sorry for the problems you are having. A cyst is defined as a fluid filled sac. Cysts are not known to be cancerous, because they have fluid and not cancer causing cells. A tumor is filled with tissue. Sometimes they are cancerfilled and sometimes not which is called benign. A cyst is usually round with smooth edges, like a balloon filled with water and a tumor can be smooth, but a cancerous tumor can be lumpy and have legs that reach out into other parts of the tissues next to it. Hope this helps you and good luck with everything.
Lilyrose77
Cyst: A cyst is an abnormal, closed sac-like structure within a tissue that contains a liquid, gaseous, or semisolid substance. A cyst can occur anywhere in the body and can vary in size. The outer, or capsular, portion of a cyst is termed the cyst wall.
Tumor: A swelling of a part of the body, generally without inflammation, caused by an abnormal growth of tissue, whether benign or malignant.
They are different.