Female, 36 years old, 21 weeks gestational age, with ventriculomegaly on prenatal ultrasound. The lateral ventricles are slightly enlarged measuring up to 11 mm at the level of the atria. The third and fourth ventricles are normal in size. The cerebral aqueduct is not adequately visualized to allow a confident assessment of patency. The cavum septum pellucidum is visualized and the corpus callosum is present. Cortical morphology and the degree of gyration are within expected limits for gestational age. The thalami and brainstem appear to be normally formed. The cerebellar vermis and hemispheres are likewise normally formed. The posterior fossa as a whole is normal in size.
Mild ventriculomegaly without clear evidence for an underlying etiology or any additional associated abnormalities.