RT Journal Article SR Electronic T1 Colloid cyst of the third ventricle: sometimes more conspicuous on CT than MR. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 875 OP 878 VO 19 IS 5 A1 Mamourian, A C A1 Cromwell, L D A1 Harbaugh, R E YR 1998 UL http://www.ajnr.org/content/19/5/875.abstract AB We present two cases of surgically proved colloid cysts that were more apparent on CT scans than on MR images. These cysts, while hyperdense on CT scans, were nearly isointense with brain on multiple MR sequences. This relative lack of visibility represents a potential pitfall when imaging a patient with headache.