2-year-old male with a history of hydrocephalus and ventricular dilatation. Evaluate the ventricles. There are no prior exams available to assess for interval changes in the ventricular system. There is a right parietal approach ventricular catheter which terminates near the anterior horn of the right lateral ventricle. A second left frontal approach ventricular catheter terminates within the anterior horn of the right lateral ventricle. The lateral ventricles are relatively decompressed compared to the dilated temporal horns. The fourth ventricle is markedly dilated and the third ventricle is dilated to a lesser degree. The dilatation of the fourth ventricle is causing mass effect on the adjacent brain stem and cerebellum. The corpus callosum is diffusely thinned and deformed but fully formed. There is an asymmetrically smaller left hemisphere compared to the right and a plagiocephalic left cranial morphology. There is focus of cystic encephalomalacia of the right inferior parietal lobe. The supratentorial white matter is diminished. The myelination pattern is grossly normal. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is no midline shift or herniation. The major cerebral flow voids are intact.
1.No prior studies are available for comparison. Decompressed bodies of the lateral ventricles with significant dilatation of the temporal horns of the lateral ventricles and marked dilatation of the fourth ventricle, which is causing mass effect on the brainstem and cerebellum. The third ventricle is dilated to a lesser degree. Right parietal and left frontal approach ventricular catheters which terminate within or near the anterior horn of the right lateral ventricle.2.Diminished supratentorial white matter and thinning of the corpus callosum, which is also deformed. Focus of cystic encephalomalacia in the right inferior parietal lobe.