In Rotterdam, at the 1949 Symposium Neuroradiologicum ([1]), English neuroradiologist James Bull stated that air or oxygen should be the current material of choice.
He remarked:
"the more often one falls back on positive contrast material*, the less capable one proves oneself as a neuroradiologist."
[1] Lindgren E 1971 A History of Neuroradiology In: Newton, Potts eds. Radiology of the skull and brain. Skull Vol. 1 Book 1; 1-25 St. Louis: C. V. Mosby
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