Page 28 - SONO 260 The Fetal Head and Brain

Fetal Head Measurements Cisterna Magna Measurement
¢Sonographic measurement of the depth of the cisterna magna can be performed as well.
— The depth of the cisterna magna should not measure over 10 mm or less than 2 mm in the transcerebellar plane.
— Measurement over 10 mm is consistent with mega cisterna magna and Dandy-Walker complex, while a measurement of less than 2 mm is worrisome for Arnold-Chiari II malformation.