Headache [R51], Reason for Study: ^Reason: r/o structural abnormality History: headache, worsening in the last year No evidence of acute ischemic or hemorrhagic lesion.There is about 1mm lower lying cerebellar tonsils through the foramen magnum, unchanged.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, or restricted diffusion/acute ischemia. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The mastoid air cells are clear.Interval clearance of left side sphenoid sinus opacification.
No evidence of acute ischemic or hemorrhagic lesion. No mass.About 1mm low lying cerebellar tonsils through foramen magnum, unchanged.