Known as a meningioma -- a tumor in the meninges, the membranes surrounding the brain -- it can produce no symptoms and is typically noncancerous.
"Half of us are walking around with [meningiomas], but you don't really know unless you happen to have an MRI," Crow's spokeswoman told E! News. "Crow has no symptoms and everything is fine. It was a random mention . . . not meant to alarm anyone. She is doing great and is healthy and happy."
In an interview on Friday published Tuesday, the nine-time Grammy winner told the Las Vegas Review-Journal, "In November, I found out I have a brain tumor. But it's benign, so I don't have to worry about it. But it gives me a fit." It was discovered, she said, because "I worried about my memory so much that I went and got an MRI. And I found out I have a brain tumor."
Crow went on to explain that a month ago, she forgot part of "Soak Up the Sun" onstage in Florida and told the audience, "I'm 50, what can I say? My brain's gone to ---- ."
In February 2006, three weeks after her breakup with fiance Lance Armstrong, Crow was diagnosed with breast cancer. She underwent what she called at the time a "minimally invasive" lumpectomy to remove the malignant tumors. She also underwent radiation therapy as a precaution.
Crow, who lives in Nashville with her two sons, told the Review-Journal she is working on an album she hopes to have out by October. She also said she is working with director Barry Levinson on a stage-musical adaptation of his 1982 film "Diner."