When is a second surgery required to treat 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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Without careful preoperative assessment, bilateral asymmetric superior oblique palsy may be mistaken for unilateral palsy. After surgery for unilateral palsy, contralateral superior oblique weakness becomes unmasked; unfortunately, then, a second surgery is required.

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