NEW YORK - Hall of Fame catcher Gary Carter says doctors discovered four "very small" brain tumors after he had an MRI exam on Friday in Florida.

The 57-year-old Carter said he expected to learn more about his diagnosis when he is examined again on Thursday at Duke Medical Center.

"My wife, Sandy, and our children and family thank you for your thoughts and prayers," Carter said in a release issued by the New York Mets and baseball's Hall of Fame on Saturday. "We ask that you please respect our privacy as we learn more about my medical condition."

Carter hit .262 with 324 home runs and 1,225 RBIs in 19 seasons in the major leagues. The 11-time all-star played his last game with the Montreal Expos in 1992 and was inducted into the Hall of Fame in 2003.

Carter is perhaps best known for helping the Mets win the World Series in 1986. He had 24 homers and 105 RBIs that year, then drove in 11 runs in the postseason.