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Related Concept Videos

Cranial Nerves: Types Part I01:14

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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves, with the first six being essential in sensory perception, motor control, and autonomic functions related to the head and neck.
Olfactory Nerve (Cranial Nerve I)
The olfactory nerve, or cranial nerve I, is unique as it is purely sensory and dedicated to the sense of smell. This nerve originates in the olfactory epithelium of the...
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Related Experiment Video

Updated: Dec 11, 2025

Ocular Therapeutic Delivery and Advanced Tissue Retrieval in Adult Rats
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Can Ophthalmologic Examination Predict Abducens Nerve Recovery After Endoscopic Skull Base Surgery?

Rachel L Whelan1, Michael McDowell2, Courtney Chou1

  • 1Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A.

The Laryngoscope
|August 19, 2020
PubMed
Summary

Abducens nerve palsy (ANP) after endoscopic endonasal skull base surgery (ESBS) is uncommon, occurring in 6.1% of high-risk cases. Partial or delayed palsies often resolve, but complete palsies rarely recover fully.

Keywords:
Abducens nerve palsyendonasal surgeryendoscopic surgeryskull base surgery

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Area of Science:

  • Neurosurgery
  • Ophthalmology
  • Skull Base Surgery

Background:

  • Abducens nerve palsy (ANP) is a potential complication of endoscopic endonasal skull base surgery (ESBS).
  • The exact frequency and prognosis of ANP following high-risk ESBS remain unclear.
  • Identifying factors associated with ANP recovery is crucial for patient management.

Purpose of the Study:

  • To determine the frequency of ANP after high-risk ESBS.
  • To evaluate the prognosis and recovery patterns of post-operative ANP.
  • To identify specific tumor types and palsy characteristics linked to ANP outcomes.

Main Methods:

  • Retrospective case series of patients undergoing ESBS for high-risk pathologies (2011-2016).
  • Identification of patients with post-operative ANP.
  • Assessment of ANP severity and recovery using a validated ophthalmologic scale at multiple time points.

Main Results:

  • 40 out of 655 patients (6.1%) developed post-operative ANP.
  • Complete resolution occurred in 64% of patients within 12 months.
  • Partial palsies showed an 83% recovery rate, while only 38% of complete palsies resolved. Meningioma and chordoma were associated with higher ANP rates.

Conclusions:

  • The incidence of ANP after high-risk ESBS is low.
  • Partial and delayed ANP have a good prognosis for recovery without intervention.
  • Complete ANP has a lower recovery rate, highlighting the importance of surgical technique and tumor selection.