The newest generation of computerized (CT) scanners appears to provide x-ray pictures of the internal structures of a rather heavily mineralized <i>Homo erectus</i> skull, i.e. <i>Pithecanthropus IV</i>, notably of its temporal bones, that reveal more details than traditional x-ray procedures. An analysis of the right temporal bone shows that it is extensively pneumatized, that the oval shape of the external meatus does not result from fractures as previously suggested, and that the middle ear and the internal auditory meatus have probably been damaged during restoration. Labyrinthine structures can be seen, and the facial nerve canal appears to be of a relatively small size.