PORTO ALEGRE, Dec 28 (Reuters) - Gremio kept their slim Brazilian title hopes alive with a 2-1 win over Atletico Goianiense in Porto Alegre on Sunday.Dudu’s own goal a minute before the halftime break put hosts Gremio ahead before Gustavo Ferrareis equalised for Atletico 12 minutes into the second half.However, it took only five more minutes for Gremio to go back into the lead with Diego Churin's goal allowed to stand after a Video Assistant Referee review.Gremio are now fifth in Serie A, 11 points behind leaders Sao Paulo. Atletico dropped a place into 12th.(Writing by Andrew Downie in London; Editing by Peter Rutherford )