RT Journal Article SR Electronic T1 Metrizamide CT ventriculography in the evaluation of a pseudoballooned fourth ventricle. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 825 OP 827 VO 5 IS 6 A1 B S Brooks A1 T el Gammal YR 1984 UL http://www.ajnr.org/content/5/6/825.abstract AB