Dandy walker variant, VSD, u/s showing concern for tether, and absent left kidney: follow up, US showed tethered cord. Brain: There is hypoplasia of the inferior cerebellar vermis and prominence of the posterior fossa cerebrospinal fluid spaces. There is decreased prominence of the anterior subarachnoid spaces, now negligible. There is a cystic lesion in the midline roof of the third ventricle adjacent to the foramina of Monro, which measures up to 8 mm. The lateral and third ventricles are perhaps slightly less dilated compared to the MRI from November 2014. There has been considerable interval progression of myelination with only remaining terminal zones of myelination in the parietal and anterior frontal lobes. There is no evidence of intracranial hemorrhage or acute infarct. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable. There is partially-imaged micrognathia.Spine: There are five lumbar type vertebrae, with partial lumbarization of S1. The conus medullaris is located at the L2-3 level. There is no evidence of filum terminale fibrolipoma and the cauda equina nerve roots are unremarkable. The vertebral column alignment is within normal limits. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The spinal cord displays normal signal and morphology. The paravertebral soft tissues are unremarkable. However, the left kidney is absent.
1. Inferior vermian hypoplasia.2. Unchanged subcentimeter probable colloid cyst.3. Slightly diminished ventricular dilatation and nearly resolved prominence of the anterior subarachnoid spaces.4. Considerable interval progression of the degree of myelination.5. The conus medullaris is located at the L2-3 level, but otherwise appears unremarkable.6. Left renal agenesis.