A type of tumor that begins in the type of cells that give rise to egg cells and is most often found in the ovaries. Dysgerminomas may also occur in other places in the body, including the central nervous system. They are the most common type of ovarian germ cell tumor and can spread to other parts of the body. They are most common in females who are younger than 20 years old.
Source: NCI Dictionary of Cancer Terms2010-08-28