Choroid plexus tumors in infancy and childhood. Focal ependymal differentiation

Rubinstein and Brucher [18] tested 22 choroid plexus papillomas for the presence of glial fibrillary acidic protein (GFAP), using the immunoperoxidase technique and obtained focal positive results in nine cases, all of which were adults (19–66 years of age). They recommended performing a similar study in children with a view to determining the incidence of “ependymal differentiation”.