Cranial aerocele; Cranial pneumocyst; Pneumatocele; Pneumocephalon; Pneumocranium
Pneumocephalus is the presence of air in the intracranial cavity. Air may be epidural, subdural, subarachnoid, or intracerebral. The most common cause of pneumocephalus is neuro-trauma. Other causes of pneumocephalus include tumors, infections, fistulous tract formation, and a complication from surgery. Symptoms of pneumocephalus include headache, lethargy, and disorientation. The air is usually absorbed by the body within hours to weeks. A major concern with pneumocephalus is infection, and antibiotics are often administered.