Trochlear nerve injury

3 Interesting Facts of Trochlear nerve injury

  1. Often caused by facial trauma; therefore, may be accompanied by associated injuries (eg, swelling, bruising) similar to those in orbital fracture
  2. Manifests as diplopia and/or vertical or horizontal motility deviation, which may resemble symptoms associated with orbital fracture
  3. Differentiate using imaging to identify nerve injury, including compression by vascular lesions, root avulsion, and nerve hypoplasia 
    • Diagnosis by conventional imaging (eg, CT scan) can be difficult owing to small size of nerves; use high-resolution 3-dimensional MRI to get a precise image of the nerve
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