Page 43 - SONO 260 The Fetal Head and Brain
P. 43
CEREBRAL MALFORMATIONS DANDY-WALKER MALFORMATION & MEGA CISTERNA MAGNA
¢It is important to note that in the early second trimester, the inferior portion of the cerebellar vermis may not be formed, thus making it appear as if the fetus has partial agenesis of the vermis.
For that reason, care must be taken to visualize an intact cerebellar vemis.
¢If the cerebellar vermis is absent and the fourth ventricle is enlarged, then Dandy-Walker malformation must be suspected.
