Phenotypic variant of CLN3 mutation

Purpose: To report a case of bilateral chorioretinal scarring due to CLN3 heterozygous deletion in an asymptomatic patient. Observations: A 63 year-old patient with a history of well-controlled diabetes presented as a referral for diabetic retinopathy. He was asymptomatic with 20/20 visual acuity in both eyes. Exam revealed bilateral multifocal chorioretinal scarring left worse than right, sparing the fovea. He was unable to provide a family history due to adoption, and his remaining medical history and review of systems were noncontributory. Inflammatory and infectious workup was negative; however, genetic testing revealed heterozygous deletion of CLN3 exons 8 and 9. His disease has been nonprogressive at all follow-up appointments. Conclusions and importance: Mutations of CLN3 can present with retina-specific findings including bull's-eye maculopathy and electroretinogram (ERG) deficits; to our knowledge this patient's presentation is unique among those with CLN3 mutations.

Abstract licence: CC BY-NC

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