Mount Fuji sign

Mount Fuji sign is seen on cross sectional imaging and is indicative of a tension pneumocephalus

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 immediate surgery to prevent permanent damage.

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Article information

rID: 12518
Section: Signs
Synonyms or Alternate Spellings:
  • Mt Fuji sign
  • Mt. Fuji sign

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Cases and figures

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    Figure 1: Mount Fuji (Japan)
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    Case 1
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    Case 2
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    Case 3
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    Extended tension ...
    Case 4
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    Case 5
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    Lung windows show...
    Case 6
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    Case 7
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    Air occupies the ...
    Case 8
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    Case 9
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