Headache. Left posterior approach ventriculostomy is unchanged, with the tip terminating medial to the left occipital horn. Unchanged dilated dysmorphic lateral ventricles. Persistent diminutive fourth ventricle and small vermis. Caudal extension of the cerebellar tonsils below the foramen magnum, unchanged from prior.There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is no midline shift. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
1.Dysplastic cerebellum, with caudal extension below the foramen magnum, small vermis, compatible with Chiari I malformation.2.Unchanged left posterior approach ventriculostomy with tip terminating medial to the left occipital horn and dysmorphic dilated lateral ventricles.