An ultrasound of a 6 month old fetus shows abnormally large brain ventricles, similar to the image found in Figure 05-09. In the text One cause of this might be

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Blockage of the cerebral aqueduct can lead to hydrocephalus, which is characterized by abnormally large brain ventricles due to the accumulation of cerebrospinal fluid (CSF). This condition can be observed in a fetus through ultrasound imaging. Reduced production of CSF or incomplete fusion of the skull at the fontanelles would not typically result in enlarged ventricles.

An Ultrasound of a 6 Month Old Fetus Shows Abnormally