title: Transchoroidal approach to the third ventricle: an anatomic study of the choroidal fissure and its clinical application.
abstract: OBJECTIVE
  We review the anatomic features of the lateral ventricle, the foramen of Monro, the third ventricle, and the choroidal fissure, and we describe the transchoroidal approach to the third ventricle. This approach consists of opening the taenia fornicis of the choroidal fissure in the body of the lateral ventricle and approaching the third ventricle between the two internal cerebral veins. This route allows further posterior enlargement of the foramen of Monro without sacrificing any neural structures. When necessary, the anterior septal vein can be sacrificed.
  
  
  METHODS
  Twenty adult cadaveric brains and four adult cadaveric heads were studied, using a magnification ranging from 3 times to 40 times, after perfusion of the arteries and veins with colored latex.
  
  
  RESULTS
  The choroidal fissure is a natural cleft between the thalamus and the fornix, and it is identified by following the choroid plexus in the lateral ventricle. The choroid plexus in the body of the lateral ventricle originates from the tela choroidea of the roof of the third ventricle and is apparently attached to the fornix by the taenia fornicis and to the thalamus by the taenia choroidea. The taenia is actually the ependyma that covers the internal wall of the ventricular cavity and the choroid plexus.
  
  
  CONCLUSIONS
  An understanding of the choroidal fissure is fundamental for use of the transchoroidal approach. Unlike transforaminal, subchoroidal, subforniceal, and interforniceal approaches to the third ventricle, which sacrifice some neural or vascular structures, the transchoroidal approach follows a natural route, and certainly it is one of the options to be considered when entry into the third ventricle is required.
authors.affiliation: Neurological Institute of São Paulo, University of São Paulo, Brazil.
authors.forename: H T
authors.initials: HT
authors.lastname: Wen
authors.forename: A L
authors.initials: AL
authors.lastname: Rhoton
authors.forename: E
authors.initials: E
authors.lastname: de Oliveira
mesh_terms: D002102:Cadaver; D002536:Cerebral Arteries / Q000033:anatomy & histology; D002550:Cerebral Veins / Q000033:anatomy & histology; D002552:Cerebral Ventricles / Q000033:anatomy & histology* / Q000601:surgery*; D002831:Choroid Plexus / Q000033:anatomy & histology; D006801:Humans; D009493:Neurosurgery / Q000379:methods*