A 6-year-old child developed head injury and nasal bleeding and showed poor respiratory effort. The computed tomography scan of brain revealed frontal sinus fracture and pneumocephalus, which was causing mass effect on the frontal lobes leading to flattening of their convexity. There was widening of interhemispheric fissure with presence of air within. This mass effect on frontal lobes with separation of the frontal poles has been called "the Mount Fuji sign," and is suggestive of tension pneumocephalus.