RT Journal Article SR Electronic T1 Endoscopic Endonasal Transsphenoidal Surgery JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 661 OP 662 VO 25 IS 4 YR 2004 UL http://www.ajnr.org/content/25/4/661.abstract AB