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Bifrontal pneumocephalus which separates the mesial portions of the frontal lobes away from the falx indicating tension (Mount Fuji sign). This is secondary to a fracture involving the inner table of the left frontal sinus, presumably acting like a valve to let air in but not out. Inferior frontal lobe haemorrhagic contusion is also seen on the right. Evidence of old right MCA infarct with gliosis.