It is possible for intracranial pneumonia to recover on its own. The most common cause of intracranial pneumothorax is cranial trauma. After trauma, air will enter the skull at the fractures and the fissures of the meninges and collect in the subarachnoid space or the ventricular system, resulting in intracranial pneumothorax and causing symptoms of high cranial pressure, and some patients may also have cerebrospinal fluid nasal leakage. If the amount of pneumonia is not large, it can be absorbed on its own and generally does not require special treatment. If the volume is large, it can produce symptoms of high cranial pressure such as nausea, vomiting, headache, etc. In large amounts of pneumonia, it can also lead to pressure on the brain parenchyma and focal signs of neurological deficits, and in the most severe cases, brain herniation can occur. Treatment is to debride as much as possible and to suture the meninges, especially the dura, to keep the cranial cavity airtight. Surgery must generally be considered whenever the intracranial pneumoperitoneum exceeds about 20 ml.