What is the role of MRI and MRA in the workup of trochlear nerve palsy (fourth nerve palsy)?

Updated: Oct 08, 2019
  • Author: Zafar A Sheik, MD, MD; Chief Editor: Andrew G Lee, MD  more...
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MRI can be used to identify lesions or inflammation that affects the parenchyma or brainstem. These lesions can include ischemia or a tumor.

MRA illustrates blood flow and can aid in identifying an aneurysm.

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