 Several tyrannosaurid skeletons from the Two Medicine Formation and Judith River Formation of Montana probably belong to Gorgosaurus , although it remains uncertain whether they belong to G. libratus or a new species . One specimen from Montana ( TCMI 2001 @.@ 89 @.@ 1 ) , housed in the Children 's Museum of Indianapolis , shows evidence of severe pathologies , including healed leg , rib , and vertebral fractures , osteomyelitis ( infection ) at the tip of the lower jaw resulting in permanent tooth loss , and possibly a brain tumor . 
