According to PEOPLE, Emmy-winning actress Mary Tyler Moore will have brain surgery to remove a meningioma, a benign tumor of the lining tissue of the brain.

"At the recommendation of her neurologist, who has been monitoring this for years, and a neurosurgeon, Mary decided to proceed with this fairly routine procedure," her rep tells PEOPLE.

The 73-year-old actress, who for decades starred in such popular series as 'The Mary Tyler Moore Show,' made a surprise appearance on today's 'Rachael Ray,' which taped last week.

Check out a clip of the episode below.

[PEOPLE]