Are brain tumors caused by a virus?

In my work I deal with cytomegalovirus in newborns and the effects that it has on their development.

There is updated research that the same virus may possibly be the cause of some brain tumors, particularly glioblastomas as shown in the scan. Science has already shown that three cancers (cervical, liver and lymphoma) are caused by viruses this may be the fourth.

You can read more about the theory and research in Newsweek.