Transient visual obscurations, without papilloedema

Two cases of frontal, space occupying tumour without papilloedema are reported. Both presented with frequent, stereotyped attacks of visual disturbance with orbital headache, neck pain and unsteadiness of gait. Intermittent occipital lobe ischaemia, related to compression of the posterior cerebral artery against the tentorium by distorted, herniating brain, seems a probable explanation.