Tension pneumocephalus: a case report and literature review.

Following a bifrontal craniotomy with frontal sinus involvement, a 64-year-old woman developed cerebrospinal fluid (CSF) rhinorrhoea. At a second operation the skull base dural defect was repaired from within the anterior cranial fossa. Ten days later, the patient developed signs and symptoms of raised intracranial pressure and mass effect. Following radiological investigation, the diagnosis of tension pneumocephalus was made and confirmed at the time of decompression. Within 24 h air had re-accumulated under pressure and concurrently an ongoing CSF leak, which until then had been subclinical, became apparent. Definitive repair of the fistula was performed via a frontal sinus approach and the patient made a total recovery. The relationship between CSF leak and delayed onset tension pneumocephalus is discussed, along with other significant issues regarding the diagnosis and management of this uncommon but dangerous condition. Copyright 1999 Harcourt Publishers Ltd.