“…Pneumocephalus, or the presence of air or gas in the cranium, usually occurs in association with barotrauma, infection, nasal cannulation, neurosurgical interventions, or spinal anesthesia. 1,2 Pneumocephalus in this patient was likely an incidental finding unrelated to his dizziness. Air embolism secondary to CT angiography is not uncommon and was the probable source.3 Because TEE did not reveal a cardiac shunt, air entry into the systemic circulation may have been due to an intrapulmonary shunt associated with sickle cell disease.…”