Traumatic brain injury in patient with biparietal thinning

A 77-year-old man was presented with progressive consciousness disturbance, presumably caused by a backward fall. Head CT findings showed a large intracerebral hemorrhage in the left parietal lobe. Radiated fractures with an oval-shaped depression of the bilateral parietal bone crossing the midline were noted. Surgical evacuation of the hemorrhage was performed via a left-sided parietal craniotomy, during which fragments from the fracture with eggshell-like thinning were noted. Biparietal thinning is an uncommon condition noted in radiological findings of a symmetrical oval-shaped depression of bilateral parietal bones with reduced diploe thickness. Cases of traumatic brain injury in patients with biparietal thinning have rarely been reported. This condition should be recognized as a possible predisposing factor for traumatic brain injury.