 In 2005 , scientists reconstructed an endocast ( replica ) of an Acrocanthosaurus cranial cavity using computed tomography ( CT scanning ) to analyze the spaces within the holotype braincase ( OMNH 10146 ) . In life , much of this space would have been filled with the meninges and cerebrospinal fluid , in addition to the brain itself . However , the general features of the brain and cranial nerves could be determined from the endocast and compared to other theropods for which endocasts have been created . While the brain is similar to many theropods , it is most similar to that of allosauroids . It most resembles the brains of Carcharodontosaurus and Giganotosaurus rather than those of Allosaurus or Sinraptor , providing support for the hypothesis that Acrocanthosaurus was a carcharodontosaurid . 
