UFC's Thiago "Pitbull" Alves will not fight at Saturday's
UFC 111, because a CAT Scan shows an irregularity in his brain, TMZ has
learned. Thiago was scheduled to rumble with Jon Fitch on
Saturday, but a pre-fight CAT Scan revealed an irregularity. A source
close to 26-year-old Pitbull tells TMZ the irregularity involves an
artery in the brain.

TMZ spoke with Alves moments ago, who told us, "I went and saw a
specialist this morning who told me I need to have the minor procedure."
We're told the procedure will be done in New York.

Alves says he expects to be sidelined from fighting for three weeks
– but expects to be back in the gym in two.