Chiari malformation, status post decompression with new headaches. Again seen are postsurgical changes of suboccipital craniectomy and resection of the posterior arch of C1 for Chiari decompression. The posterior CSF space at the level of the foramen magnum remains well expanded and similar to the prior exam. The cerebellar tonsils descend to the level of the basion and the demonstrating normal rounded configuration. Normal CSF flow is seen both anterior and posterior to the brainstem at the level of the foramen magnum. There is diminished flow dorsal to the more superior aspect of the cerebellum with suggestion of adhesion but unchanged. The remainder of the brain demonstrates normal morphology. Few foci of T2/FLAIR hyperintensity are seen in the subcortical and periventricular white matter, which are nonspecific, but compatible with mild age-related white matter changes. No new focal abnormalities are detected. The ventricular system is patent and normal in size.There is moderate aspiration of the sphenoid sinus which is increased since 12/11/2014.CERVICAL SPINE MRI
1.Again seen are postsurgical changes of Chiari decompression with preserved CSF spaces and biphasic flow at the neo-foramen magnum. There is diminished flow dorsal to the superior cerebellum at the margin of the suboccipital craniectomy with suspected adhesion. Finding is unchanged. There is increased opacification of the sphenoid sinus. Otherwise the remainder of the brain parenchyma is within normal limits for age.2. Stable minimal degenerative disk disease in the cervical spine. No cord signal abnormality or syrinx. No spinal canal or neural foraminal stenosis.