Page 33 - SONO 260 The Fetal Head and Brain
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  CEREBRAL MALFORMATIONS AQUEDUCTAL STENOSIS
 Aqueductal stenosis is the most common cause of hydrocephalus in utero.
— The cerebral aqueduct (aqueduct of Sylvius), located between the third and fourth ventricle of the brain, may be narrowed, thus preventing the flow of CSF from the third to the fourth ventricle.
— This obstruction level will cause the third ventricle and both lateral ventricle to expand, while the fourth ventricle remains normal.
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