Hereditary ataxia, unspecified [G11.9] / Other symptoms and signs involving the musculoskeletal system [R29.898], Reason for Study: ^Reason: scan ataxia AND acute leg weakness L History: ataxia; mild left leg weakness Brain MRINo evidence of acute ischemic or hemorrhagic lesion.There are gyriform susceptibility artifacts following bilateral frontal lobe around the area of frontal sinuses. This could represent artifacts from the frontal sinus air but also can represent prior subarachnoid space blood.There are evidence of encephalomalacia on bilateral frontal gyrus rectus, mesial and lateral orbital gyri (left worse than right) most likely represent prior traumatic contusion.Disproportional diffuse cerebellar volume loss is seen without definitive evidence of pontine volume loss. The ventricles, sulci and cisterns are symmetric and unremarkable. There is no mass, mass effect, edema, midline shift, intra or extra-axial fluid collection/hemorrhage, restricted diffusion/acute ischemia. The cranial-cervical junction are normal. The paranasal sinuses and mastoid air cells are clear.Brain MRA3D time of flight MOTSA MRA brain images with maximum intensity projections of the anterior/posterior intracranial circulation demonstrate bilateral fetal PCAs with hypoplastic vertebrobasilar system which is a normal variation. There is no evidence of major intracranial arterial occlusion or stenosis.There is no arterial aneurysm.
1. No evidence of acute ischemic or hemorrhagic lesion.2. Disproportional cerebellar volume loss without associated with pontine volume loss.3. Chronic bifrontal traumatic contusion.4. Hypoplastic vertebrobasilar system with bilateral fetal PCAs. No evidence of intracranial arterial luminal stenosis, occlusion or aneurysm. 