Headache [R51], Reason for Study: ^Reason: Pt with hx of migraines, but worsening and some change in character History: see above Brain MRINo evidence of acute ischemic or hemorrhagic lesion. No evidence of abnormal enhancement.There is about 4 mm dominant displacement of right cerebellar tonsil through the foramen magnum.The ventricles, sulci and cisterns are unremarkable. 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.Brain MRA3D time of flight MOTSA MRA brain images with maximum intensity projections of the anterior/posterior intracranial circulation demonstrate normal ICAs, MCAs and ACAs. Vertebrobasilar system appears to be normal.
1. Borderline cerebellar tonsillar dominant displacement through the foramen magnum.2. No evidence of acute ischemic or hemorrhagic lesion. No evidence of abnormal enhancement.3. Normal brain MRA 