1990 年 3 巻 2 号 p. 90-96
Fourteen cases of fetal dysraphism were analyzed in lights of neuroimagings and diagnostic problems. In cases of cranial dysraphic states, early diagnosis during the period oflegal termination was possibly made with clearly delineated morphology in ultrasonography (US) . Cephaloschisis, in one craniorachischisis and four anencephaly, was satisfactorily diagnosed in ultrasonographic configuration of the absent calvaria and high intensity shadow of exposed placode of MR TI weighted images. Intra and extra-cranial structures were properly evaluated in fetuses with cranium bifidum cysticum by ultrasonography.
In spinal dysraphism, however, the primary spinal lesion was hardly evaluated ultrasonographically, unless the lesion is associated with a significant cystic mass.
Prenatal neuroimagings of fetal dysraphism should be established along with US morphology evalution and other specific tools including plain X-rays, fetography. CT and MR may play significant roles depending upon the type of malformation.