Congenital Malformations

Congenital malformations of the brain are a complex group of disorders with a wide variance of appearances (Table 13). The reader should keep in mind that patients with Chiari II malformations, Dandy-Walker malformations, and holoprosencephaly often have congenital hydrocephalus and may require CSF diversion. It is also important to remember that many patients with congenital brain malformations have ventriculomegaly in the absence of hydrocephalus. In the absence of progressive mac-rocephaly, large ventricles are not an indication for CSF-diversion procedures. Genetic syndromes and congenital anomalies are discussed in Chapter 7.

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