Tension pneumocephalus following posterior fossa surgery in sitting position. A report of 2 cases.

Tension pneumocephalus is a rare complication of posterior fossa surgery in sitting position. We encountered 2 patients with this complication amongst 60 patients operated during the past 2 years. All 60 patients had some amount of intracranial air at the end of surgery. The causative factors of tension pneumocephalus are briefly reviewed. Prompt recognition of this complication is very important. Diagnosis and management are discussed.