3 Interesting Facts of Trochlear nerve injury
- Often caused by facial trauma; therefore, may be accompanied by associated injuries (eg, swelling, bruising) similar to those in orbital fracture
- Manifests as diplopia and/or vertical or horizontal motility deviation, which may resemble symptoms associated with orbital fracture
- 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
