Other headache syndrome [G44.89], Reason for Study: ^Reason: 32F with headaches, sister with recent ruptured brain aneurysm History: headaches No evidence of acute ischemic or hemorrhagic lesion.There is about 5.7 mm downward herniation of cerebellar tonsil through the foramen magnum.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.About 5.7 mm downward herniation of cerebellar tonsils indicating possible Chiari I malformation.