true of the lesions in multiple sclerosis

Question Number 1426

Question:
the following are true of the lesions in multiple sclerosis

a) they usually demonstrate mass effect
b) the majority measue over 20mm
c) are usually orientated parallel to the anteroposterior axis of the cranium
d) the subcortical U fibers are typically spared
e) are not well defined on proton density MR imaging


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