Female, 20 months old, with multiple intracranial lesions (hypothalamic, tectal and vermian) status post biopsy of the vermian lesion Sequelae of the prior occipital approach biopsy are barely detectable. Again seen is a somewhat polypoid area of parenchymal thickening centered on the right cerebellar vermis with projection into the fourth ventricle. As before, this lesion follows the signal characteristics of the surrounding brain parenchyma on all sequences, and there is no associated pathologic enhancement. The lesion does not appear to have significantly changed in size.Also unchanged is periaqueductal thickening with stenosis of the cerebral aqueduct. The previously reported hypothalamic lesion is not well visualized on the present study.No new lesions are detected. No parenchymal edema or mass effect is observed. The right cerebral hemisphere is smaller than the left. A right frontal approach ventricular catheter is in stable position. The supratentorial ventricles remain decompressed.
1.Stable lesion of the right cerebellar vermis.2.Stable periaqueductal thickening with associated aqueduct stenosis.3.The previously demonstrated hypothalamic lesion is not well visualized on the present study.4.The shunted supratentorial ventricles remain decompressed similar to prior.