Introduction: The Mount Fuji sign is a common sign of tension pneumocephalus, usually occurring after surgical evacuation of subdural hematomas (SDHs). It may be suspected when such postsurgical patients present with headache or vomiting or other neurological signs and is diagnosed by computed tomography (CT) scan of the brain. It usually occurs within the immediate postoperative period but may rarely be seen even months after the surgery.
Case report: We present the case of a 69-year-old male who developed a subdural collection of air, following surgery to evacuate a subdural hematoma.
Conclusion: The patient was successfully treated with conservative measures including administering 100% oxygen, adequate analgesia and Fowler's position. However, severe neurological symptoms such as seizure or obtundation warrants emergency decompression.
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