Posttraumatic Emphysema of the Optic Nerve Sheath

Area of Science:

• Ophthalmology
• Neurology
• Trauma Surgery

Background:

• Optic nerve sheath emphysema is a rare condition characterized by the presence of air within the optic nerve sheath.
• It can occur secondary to head trauma, barotrauma, or iatrogenic causes.
• This case highlights a unique presentation following severe head trauma.

Observation:

• A 19-year-old female sustained massive head trauma requiring emergent neurosurgery.
• Computed tomography (CT) incidentally revealed air within the optic nerve sheath.
• Ophthalmic examination at 6 weeks showed excellent visual acuity (20/25) and color perception.

Findings:

• Despite the presence of air, the patient demonstrated remarkable visual recovery.
• Ophthalmic imaging revealed an afferent pupillary defect, mild disc pallor, and optic nerve atrophy on optical coherence tomography (OCT).
• These findings suggest that optic nerve sheath emphysema, while potentially damaging, may not always lead to permanent visual impairment.

Implications:

• This case underscores the importance of recognizing optic nerve sheath emphysema as a potential complication of head trauma.
• It suggests that prompt neurosurgical intervention for the primary trauma may indirectly benefit optic nerve function.
• Further research into the long-term visual outcomes and management strategies for posttraumatic optic nerve sheath emphysema is warranted.