title: Flexible and floating choroid plexus cyst of the third ventricle: an ultrasonographic video documentation.
abstract: BACKGROUND
  Choroid plexus cysts can lead to isolation of the lateral ventricles and distension of the third ventricle. We present an ultrasonographic video documentation of an infant with variably shaped and localized choroid plexus cyst of the third ventricle.
  
  
  METHODS
  An infant had periods of increased intracranial pressure with changing dilatation of the first to third ventricle. Cerebral ultrasonography of the not crying boy demonstrated a choroid plexus cyst limply hanging down from the roof of the third ventricle to the beginning of the aqueduct of Sylvius. During crying, the cyst prolapsed from the third into left lateral ventricle and was strangled by the foramen of Monro. Endoscopic cyst fenestration and third ventriculostomy continuously solved the problem of intermittent hydrocephalus occlusus.
  
  
  CONCLUSIONS
  Depending not only on localization and size but also on cyst form and cerebrospinal fluid pressure, a single choroid plexus cyst can cause various obstructions of cerebrospinal fluid pathways.
authors.affiliation: Department of Neuropediatrics, University Medical Center Schleswig-Holstein, Campus Kiel, Christian-Albrechts-Universität zu Kiel, Germany. van.baalen@pedneuro.uni-kiel.de
authors.forename: Andreas
authors.initials: A
authors.lastname: van Baalen
authors.forename: Ulrich
authors.initials: U
authors.lastname: Stephani
mesh_terms: D002831:Choroid Plexus / Q000000981:diagnostic imaging* / Q000473:pathology*; D003560:Cysts / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D020542:Third Ventricle / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000379:methods*