Pseudotumour cerebri is the name of a syndrome characterized by headache and 
papilloedema, with normal cerebral CT/MR studies and CSF with a high pressure 
and normal laboratory findings. We describe four patients who fulfilled the 
diagnostic criteria of this condition (including normal 0.5T MR studies). They 
all had cerebral angiograms showing minor abnormalities localized to the level 
of the superior longitudinal sinus. All improved on treatment with 
anticoagulants and steroids. In view of these findings we consider that in cases 
of pseudotumour cerebri without a clear aetiological factor, an angio MR study 
should be done, or if this technique is not available, a cerebral angiogram 
should be done, to exclude cerebral venous drainage defects.