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Updated: Feb 7, 2026

Implantation and Evaluation of Melanoma in the Murine Choroid via Optical Coherence Tomography
Published on: December 2, 2022
DISAPPEARING CHOROIDAL MELANOMA ON OPTOS: THE NOSE ARTIFACT
Spencer M Onishi1, Gordon S Crabtree1, Steven J Marks1
1Retina Service, Geisinger Eye Institute, Danville, Pennsylvania; and.
Purpose:
To illustrate a potentially concerning artifact on Optos wide-angle imaging.
Methods:
Case report.
Results:
A healthy 11-year-old girl, with no medical history, was found to have a lightly pigmented superotemporal choroidal tumor, suspicious for melanoma, which was detected on Optos wide-angle imaging by her optometrist. On referral to the retinal specialist, the mass was not visible on funduscopy. B-scan ultrasonography depicted flat retina and no visible mass. Review of the Optos image revealed that the pseudomelanoma represented the patient's nose.
Conclusion:
Optos wide-angle imaging provides broad retinal imaging; however, artifacts from patient positioning can lead to the nose artifact.
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