Neuroradiology, neurophys

  1. What happens to blood on MRI as time progresses?
    • 24hrs - T1 Hypo T2 Hyper
    • 1-3 days - T1 Hypo T2 Hypo
    • <7days - T1 Hyper T2 Hypo
    • <14days - T1 hyper T2 Hyper
    • >14days - T1 Hypo T2 Hypo
  2. Whats the callosal angle measurement for NPH?
    Less than 90 degrees
  3. Whats the midbrain to pons ratio for PSP?
    <0.52 with the widest part of the midbrain measuring <9.35mm
  4. Pigmented neurons with abnormal purplish inclusions?
    Lewy bodies
  5. Classic EEG pattern of REM sleep?
    Sawtooth pattern
  6. What are the sensitive and specific MR findings for Intracranial hypotension?
    • Mammilo pontine distance ≤5.5mm
    • Pontomesencephalic angle ≤50 degrees
  7. Positive sharp waves (PSWs) and fibrillation potential happen in?
  8. Early recruitment happens in?
    Myopathic problems
  9. What is the order of EMG changes following nerve transection?
    • The earliest EMG manifestation of a neurogenic lesion is reduced recruitment, which occurs as soon as conduction along the axon fails.
    • Several weeks after the injury, if wallerian degeneration occurred, abnormal insertional activity, including fibrillation potentials, will be evident.
    • Later, as surviving axons sprout collaterals to supply denervated muscle fibers, motor unit prolongation and polyphasia will appear
  10. For SSEPs, what are the latency numbers for various anatomical structure?
    • Erbs - 9
    • Cervical cord - 13
    • Brain stem - 14
    • Cerecral cortex - 20
  11. Arch like waves on EEG that meet in the middle?
    Mu waves - resting normal activity which is suppressed by motor activity.
  12. EMG findings of radiculopathy?
    • Low amplitude motor response
    • Normal sensory respone
    • Prolonged F-wave
    • No conduction block or distal motor latency prolongation
Card Set
Neuroradiology, neurophys