RT Journal Article SR Electronic T1 Intraocular haemorrhage as a complication of pneumoencephalography. JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 375 OP 380 DO 10.1136/jnnp.39.4.375 VO 39 IS 4 A1 I F Moseley A1 J B Pilling YR 1976 UL http://jnnp.bmj.com/content/39/4/375.abstract AB The ocular fundi of 20 patients were examined before and after pneumoencephalography. In four of these, fresh venous retinal haemorrhages were seen, and a further patient had developed an exudate. Possible reasons for a rise in retinal venous pressure include bodily inverting the patient, compression of the thorax, the use of positive pressure respiration, and the air injection itself. It may be advisable to take steps to limit the effects of such possible causative factors.