[Tension pneumocephalus: a possible complication of posterior fossa craniotomy in the sitting position].

The authors describe a case of subdural tension pneumocephalus complicating the early postoperative course after posterior fossa craniotomy in the sitting position. This complication was promptly recognized and was treated successfully by allowing the compressed air to escape through frontal burr holes. A brief review of the recent literature is presented and the possible pathological mechanism is discussed. Emphasis is given to means of early detection and measures of prevention.