Mount Fuji sign is seen on cross sectional imaging and implies tension pneumocephalus is present.
The sign refers to the presence of air (pneumocephalus) between the tips of the frontal lobes giving the appearance of Mount Fuji 1-3. It suggests that the pressure of the air is at least greater than that of the surface tension of cerebrospinal fluid between the frontal lobes 1-3.
Appearance of this sign often warrants an immediate surgery to prevent permanent damage.
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