RT Journal Article SR Electronic T1 The interventricular extension of choroid plexus papillomas. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 469 OP 472 VO 8 IS 3 A1 K D Hopper A1 L C Foley A1 N L Nieves A1 J G Smirniotopoulos YR 1987 UL http://www.ajnr.org/content/8/3/469.abstract AB Four cases of choroid plexus papilloma extending through the foramen of Monro are presented. All four patients were evaluated by contrast-enhanced CT and two of these were also evaluated by neurosonography. No other intraventricular tumor commonly extends through a ventricular outlet. The radiographic demonstration of this extension of an intraventricular mass through the foramen of Monro, cerebral aqueduct, or foramen of Luschka or Magendie represents an ancillary diagnostic sign of choroid plexus papilloma.