Headache, dizziness, history of migraine and subarachnoid hemorrhage No evidence of acute ischemic or hemorrhagic lesion.On the first enhancement T1 axial scan (series #1001, image #7) shows intramedullary junction right posterior aspect subtle increased signal intensity. However, this lesion was not shown on 3-D postcontrast T1 imaging. In addition, there is no other imaging sequence which show any abnormal findings on this on this area.Therefore, this subtle increased signal intensity is most likely artifactual.There is no evidence of abnormal enhancement on the scan.The ventricles, sulci and cisterns are symmetric and unremarkable. The gray-white matter differentiation is normal. There is no mass, mass effect, edema, midline shift, intra or extra-axial fluid collection/hemorrhage, restricted diffusion/acute ischemia, or abnormal contrast enhancement. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
No evidence of acute ischemic or hemorrhagic lesion.No evidence of abnormal enhancement.