Female, 36 years old, 36 weeks gestational age, with enlarged fetal ventricles and cisterna magna on ultrasound. The right lateral ventricle is enlarged measuring up to 13 mm in diameter at the level of the atrium. The left lateral ventricle is within normal limits measuring up to 8 mm at the level of the atrium. The third ventricle is within normal limits. The cerebral aqueduct is patent. The fourth ventricle is within normal limits.The cisterna magna measures up to 12 mm. However, the posterior fossa structures including the brainstem, cerebellar vermis and cerebellar hemispheres are otherwise normally formed and unremarkable.The corpus callosum is fully formed and intact. The pituitary region is unremarkable. The degree of cerebral gyration is appropriate for gestational age. No areas of parenchymal signal abnormality are suspected. No findings to suggest intracranial hemorrhage or any abnormal extra-axial fluid collection are identified.
1.Enlargement of the right lateral ventricle.2.Prominence of the cisterna magna.3.The remainder of the examination is within normal limits.