Optic-nerve compression by the internal carotid artery as a cause of “unexplained: optic atrophy
Richard C. Kho, MD
Objective
To present a case of bilateral optic neuropathy secondary to optic-nerve compression by the internal carotid artery (ICA).
Methods
Observational case report; single patient seen in private practice.
Results
Compression of the optic nerves by the ICAs as the etiology of unexplained progressive optic neuropathy is reported. The patient refused further invasive procedures after diagnosis.
Conclusion
Compressive optic neuropathy due to direct pressure by the adjacent ICA should be considered as a possible etiology of occult, progressive visual loss in an otherwise healthy patient. Although rare, the clinical picture of progressive optic neuropathy backed by evidence of magnetic resonance imaging (MRI) should clinch the diagnosis early and spare the patient from further unnecessary ancillary work-up.
Keywords: Compressive optic neuropathy, Internal carotid artery, Dolichoectatic artery, Fusiform enlargement