Neuroanatomical correlation between choroid plexus mass in thechoroidal fissure and the interventricular foramen area

ABSTRACT

Introduction: Our aim was to evaluate the correlation between choroid plexus mass (g) in the choroidalfissure and the ipsilateral interventricular foramen area, bilaterally. Material and methods: We analyzed sevencadaveric specimens with exposed brain, reaching the transcallosum access in all specimens, dissecting thecorpus callosum to reach the left and right choroidal fissure. After identifying the thalamostriate and septalveins, we localized the interventricular foramen scrapping all the choroid plexus in that region as well asits posterior extension allowing us to completely visualize the III ventricle. The area of the interventricularforamen was calculated with a pachimeter using the formula ðR2. The choroid plexus mass was measured withan appropriate scale. The choroid plexus mass and ipsilateral interventricular foramen correlation was evaluatedby the Pearson correlation. Results and conclusion: Neither difference between right and left choroid plexusmass was observed (Student t test – p = 0.374) nor with interventricular foramen area (p = 0.345) andwe decided to evaluate the 14 results together. There was correlation between choroid plexus mass and itsrespective IF (r = 0.6863; p < 0.01). A better knowledge of the choroidal fissure is very important to a moreprecise approach to the pathologic processes that affect the III ventricle. Different from the transforaminal,interforniceal, subchoroidal, and subforniceal, the choroidal fissure access is a natural approach. We speculatethat undetermined etiology hydrocephaly may have its origins in a deficit of ventricular drainage or in thechoroid plexus excess.