 Brain MRI:The ventricles and sulci are diffusely prominent, with at least moderate dilatation of the ventricles which appears to be due to an ex vacuo in associated with a relatively decreased white matter volume. There is also volume loss noted involving the cerebellum. Redemonstrated is a polymicrogyric appearance of the posterior parietal and occipital lobes bilaterally. The basal cisterns remain patent. There is no midline shift or mass effect. There is no diffusion abnormality. No extra-axial fluid collection is identified. The midline structures and craniocervical junction are within normal limits. There is no significant thinning of the corpus callosum. Fluid is present with a single left mastoid air cell. The right mastoid air cells are clear.Brain MRA: There is antegrade flow within the distal bilateral vertebral arteries, within the basilar artery, distal bilateral internal carotid arteries and carotid siphons and bilateral anterior, middle and posterior cerebral arteries. No arterial stenoses, occlusions or aneurysms are identified. No arteriovenous malformations are identified an. Incidental note is made of ACA triplication as well as a hypoplastic right vertebral artery ending in PICA, both congenital vascular variations.Brain MRV:There is normal venous flow demonstrated within the internal cerebral veins, vein of Galen, straight sinus, superior sagittal sinus and within the bilateral transverse and sigmoid sinuses. No dural venous sinus thromboses or occlusions are identified. Note is made of a hypoplastic left transverse sinus.
1.Stable prominent expansile dilatation of the ventricles with associated enlargement of extracerebral subarachnoid space. Findings are favored to relate to decreased white matter volume which may in part relate to patient's history of prematurity and associated chronic periventricular leukomalacia, given the lack of associated abnormal signal. 2.Fluid is present with a single left mastoid air cell.3.Stable polymicrogyric appearance of the posterior parietal and occipital lobes bilaterally.4.Negative noncontrast brain MRA and MRV.