Pseudoduplication of the optic disk.
OBJECTIVE
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.


CONCLUSIONS
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.
From the *Department of Ophthalmology, Stanford University, Stanford, California; and †Department of Ophthalmology, Palo Alto Medical Foundation, Palo Alto, California.
Young
Y
Sun
Jacqueline K
JK
Ng
Michael W
MW
Gaynon