during may through october 1987 , 17 children between the ages of 3 and 18 years with brain tumors underwent mri examinations , before and after gd-dtpa ( 11 gliomas , 4 medulloblastomas , 1 craniopharyngioma , and 1 child with neurofibromatosis and no pathologic diagnosis ) .
C0017638
gliomas
C0025149
medulloblastomas