Related Experiment Video
Updated: Apr 21, 2026

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
Pseudoduplication of the optic disk
Young Sun1, Jacqueline K Ng, Michael W Gaynon
1From the *Department of Ophthalmology, Stanford University, Stanford, California; and †Department of Ophthalmology, Palo Alto Medical Foundation, Palo Alto, California.
Purpose:
The purpose of this study was to report a case of a chorioretinal coloboma mimicking a second optic disk in an asymptomatic 12-year-old boy.
Methods:
This is a case report.
Results:
An asymptomatic 12-year-old boy presented with a chorioretinal coloboma of the right eye giving the impression of a second optic disk. The patient also had a superior visual field defect.
Conclusion:
True optic nerve duplication is a rare entity that can be mimicked by other etiologies, including choroidal colobomas and postinflammatory lesions, requiring careful examination by clinicians.
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