Famous American singer-songwriter Sheryl Crow has revealed she has been diagnosed with brain tumor, but claims she does not worry a bit as it is benign.

"Please don't worry about my 'brain tumor,' it's a noncancerous growth. I know some folks can have problems with this kind of thing, but I want to assure everyone I'm OK," she wrote on her Facebook page.

In an interview with the Las Vegas Review-Journal, Crow admitted that she went to see a doctor in November. "I worried about my memory so much that I went and got an MRI. And I found out I have a brain tumor."

The singer sounded casual, saying her doctor said not to worry about it, "but it gives me a fit." In 2006, Crow, mom to sons Wyatt and Levi, battled breast cancer.

Now Crow doesn't need surgery but will have periodic scans to monitor the growth.

According to the singer's representative, Crow was diagnosed with meningioma, a common type of brain tumor.

Elizabeth Taylor had one; so did Mary Tyler Moore, said Gupta.

"It's a tumor that typically grows between the outer layer of the brain and the brain itself. So it's not actually inside the brain," he said.

Depending on their size, some people will have their tumors removed right away. Some, like Crow, take the wait-and-see approach, while others might never need an operation or treatment.

"Really appreciate everyone's love and concern, I feel so blessed to have the support of all my fans, but I'm good -- really!" wrote Crow.