TY - CHAP M1 - Book, Section TI - ANOMALIES OF THE CEREBELLUM A1 - Pilu, Gianluigi A1 - Malinger, Gustavo A1 - Buyukkurt, Selim A2 - Timor-Tritsch, Ilan E. A2 - Monteagudo, Ana A2 - Pilu, Gianluigi A2 - Malinger, Gustavo Y1 - 2017 N1 - T2 - Ultrasonography of the Prenatal Brain, 3e AB - KEY POINTSA wide variety of congenital anomalies can affect the cerebellum. The antenatal findings overlap among different pathologies and normal variants. Consequently, a specific diagnosis is often not possible.One of the most common abnormal findings that is encountered is the impression of a communication between the fourth ventricle and the posterior cisterna magna. When this is seen after 20 postmenstrual weeks' gestation, it identifies a group of conditions that are commonly referred to as the Dandy-Walker complex.Within the Dandy-Walker complex, cases with a normal appearance of the vermis and cisterna magna most frequently have a normal outcome. Fetuses with an enlarged cisterna magna and/or an abnormal vermis frequently exhibit abnormal development, but a precise prognosis is difficult to predict.A large cisterna magna (> 10 mm) when isolated, usually has a good outcome.Other cerebellar anomalies can be encountered, but the diagnosis is often difficult or impossible and the prognosis difficult to predict. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/29 UR - obgyn.mhmedical.com/content.aspx?aid=1138379723 ER -