title: Early surgical management of antenatal diagnosed cystic lesions of the foramen of Monro causing monoventricular hydrocephalus.
abstract: BACKGROUND
  After diagnosis of an antenatal monoventricular hydrocephalus caused by a cystic lesion of the foramen of Monro, treatment modality and time frame may be difficult to assess. Previously, this type of hydrocephalus was often treated with internal shunting. The advent of neuroendoscopy has changed the surgical management of this pathology.
  
  
  METHODS
  We report on two cases of cystic lesions of the foramen of Monro discovered on antenatal ultrasonography. A cavum veli interpositi in one case and a choroid plexus cyst in the other were responsible for unilateral hydrocephalus. In both cases, endoscopic treatment before 1 month of age was performed as the primary procedure with a successful outcome.
  
  
  CONCLUSIONS
  We advise early endoscopic treatment for newborns presenting with progressive unilateral hydrocephalus caused by a cystic lesion of the foramen of Monro. It has been, in our hands, a safe and efficient procedure.
authors.affiliation: Neurosurgery Department and Unit of Paediatric Neurosurgery, Nancy University Hospital, 29 Avenue du Maréchal de Lattre de Tassigny, 54035 Nancy Cedex, France. s.freppel@chu-nancy.fr
authors.forename: Sébastien
authors.initials: S
authors.lastname: Freppel
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Marchal
authors.forename: Anthony
authors.initials: A
authors.lastname: Joud
authors.forename: Catherine
authors.initials: C
authors.lastname: Pinelli
authors.forename: Olivier
authors.initials: O
authors.lastname: Klein
mesh_terms: D001921:Brain / Q000473:pathology / Q000601:surgery; D020863:Central Nervous System Cysts / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery*; D002552:Cerebral Ventricles / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D002831:Choroid Plexus / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery*; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging; D008297:Male; D044583:Neuroendoscopy; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016896:Treatment Outcome; D014463:Ultrasonography