Male, 18 years old, with hydrocephalus, aqueductal stenosis, history of third ventriculocisternostomy. Yearly follow-up examination. Lateral and third ventriculomegaly is again seen appearing similar in degree to the prior examinations. For example, the transverse diameter of the lateral ventricles measures approximately 65-mm which is unchanged. The fourth ventricular caliber and morphology are within normal limits.On thin section sagittal T2-weighted imaging, a defect is again seen within the floor of the third ventricle. On cine flow imaging, unambiguous and brisk flow related signal is detected from the basal cistern, through this defect, into the third ventricle.As before, the cerebral aqueduct is not patent anteriorly, and at the point where the tectum contacts the tegmentum, the tegmentum appears somewhat nodular.Sequelae of prior right frontal ventriculostomy is again seen. The corpus callosum remains thinned but intact. The periventricular white matter is also thinned similar to prior.
1.Stable lateral and third ventriculomegaly.2.The third ventriculocisternostomy remains patent.3.Occlusion of the cerebral aqueduct is again seen with no change in the somewhat nodular appearance of the midbrain tegmentum.4.Anatomic distortion of the brain likely secondary to prior hydrocephalus is unchanged.