CASE 4 History: A 24-year-old man presents with headaches and dizziness. 1. What should be included in the differential diagnosis? (Choose all that apply.) 2. All of the following congenital osseous abnormalities may be seen in association with Chiari I malformation except: b. Occipitalization of the atlas 3. All of the following cerebrospinal fluid (CSF) flow abnormalities may be seen in Chiari I malformation except: a. Impaired CSF systolic (craniocaudal) pulsations b. Impaired CSF diastolic pulsations c. Pulsatile downward motion of the cerebellar tonsils d. Reduction of CSF flow in the retrocerebellar subarachnoid space 4. What measurement of tonsillar ectopia is considered abnormal in adults?
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