Dizziness and giddiness [R42], Reason for Study: ^Reason: R/o posterior stroke History: dizziness Brain MRIMotion artifact degraded image quality of some exams.No evidence of acute ischemic or hemorrhagic lesion on the scan. 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 midline structures and 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 irregular lumen on bilateral MCA bifurcation or distal, however, these findings are more likely artifactual mainly due to patient's motion. Bilateral ICAs, MCAs and ACA appear to be within normal limits. No evidence of significant luminal stenosis, no intracranial arterial aneurysm.Vertebrobasilar system appears to be normal. Neck MRAArterial bolus timing was missed, thus venous phase was used for this interpretation thus cannot be precise. If needed, the Neck MRA can be performed without additional charge.3D MRA neck post-gadolinium images with maximum intensity projections of the cervical vasculature demonstrate normal flow enhancement in a normal aortic arch origin of the right brachiocephalic, left common carotid, and left subclavian arteries. There is normal flow enhancement through the bilateral common carotid, carotid bifurcations, internal/external carotid, and vertebral arteries. Proximal bilateral CCAs and bilateral vertebral artery origins cannot be evaluated.
1. No evidence of acute ischemic or hemorrhagic lesion.2. Normal brain MRA3. Extracranial craniocervical arterial system appears to be normal, however, since arterial phase examination is not available, precise evaluation is not possible. Neck MRA can be performed without additional charge if requested. 