CASE 156 History: A 61-year-old man presents with a history of a boat accident 6 months earlier, resulting in cord injury and paralysis. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Subacute combined degeneration e. Astrocytoma 2. Which of the following statements regarding wallerian degeneration is true? a. MRI signal abnormalities are in the lateral columns above the injury site. b. MRI signal abnormalities are in the posterior columns above the injury site. c. MRI signal abnormalities are in the lateral columns and dorsal columns below the injury site. d. MRI signal abnormalities are in the lateral columns and dorsal columns above the injury site. 3. How long after cord injury does wallerian degeneration become visible on MRI? a. 7 days b. 2 weeks c. 5 weeks
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