English: FIG. 23. TRAUMATIC DEMENTIA. The patient was struck by an engine, the principal injury being to the skull. A portion of the frontal and parietal bones, together with a part of the brain substance, were removed by a surgeon. After recovering from the immediate effects of the operation the man became maniacal, and had repeated epileptic seizures. Both affections slowly subsided, and left him profoundly demented and incapable of speaking more than two or three words. There is no paralysis of the limbs, though after the administration of an hypnotic the left limb is dragged. Over both fronto-parietal regions there are large lacunae in the bony tissue. The one on the right side is partly filled in by a fibrous material. This depression measures 1 x 4% centimetres. That on the left side is 6 x 4 centimetres, and under the skin the pulsations of the brain can be both seen and felt.