Visual Diagnosis in Emergency Medicine| Volume 57, ISSUE 4, P569-570, October 2019

Mount Fuji Sign: Tension Pneumocephalus in the Emergency Department

Published:September 24, 2019DOI:
      A 59-year-old man with a history of Graves' disease and diabetes presented to our emergency department with complaints of headache and vomiting. He had undergone surgical orbital decompression of his left eye for Graves' exophthalmos the previous day. On examination, the patient was somnolent with fixed-gaze palsy in his left eye. Pupils were reactive bilaterally. His vitals were unremarkable. The patient's computed tomography (CT) images are shown in Figure 1, Figure 2.
      Figure thumbnail gr1
      Figure 1Bone windows of the computed tomography scan demonstrating the Mount Fuji sign.
      Figure thumbnail gr2
      Figure 2Brain windows demonstrating the Mount Fuji sign. Arrowheads point at the characteristic twin-peak appearance of the frontal lobe.
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