Phenotypic expansion of KCNJ13-associated snowflake vitreoretinal degeneration

Noy Ashkenazy, Jesse D. Sengillo, Prashanth G. Iyer, Catherin I. Negron, Nicolas A. Yannuzzi, Audina M. Berrocal

Research output: Contribution to journalArticlepeer-review


Introduction: An 18-year old highly myopic woman presented with bilateral retinoschisis associated with a unilateral macular hole in the right eye and vitreomacular traction in the left eye. Methods: Genetic studies disclosed a heterozygous pathogenic variant in the KCNJ13 gene was identified (c.484C>T (p.Arg162Trp)), consistent with a diagnosis of snowflake vitreoretinal degeneration (SVD). Results: While there were no corneal guttata, juvenile cataracts, or perivascular sheathing in this case, salient features of SVD included a fibrillar vitreous structure, crystalline retinopathy, and flattened optic nerves. The patient developed a FTMH in the left eye at 17 months follow up, followed by a rhegmatogenous retinal detachment (RRD) requiring 2 surgical repairs. Conclusion: This case expands on the spectrum of clinical features in SVD, including retinoschisis and FTMH. It also characterizes optical coherence tomography findings in this rare disease entity. We emphasize the importance of using panel-based genetic testing to clinically distinguish and further define atypical vitreoretinopathies.

Original languageEnglish (US)
JournalOphthalmic Genetics
StateAccepted/In press - 2022
Externally publishedYes


  • inherited vitreoretinopathy
  • macular hole
  • ophthalmic genetics
  • pediatric retina
  • retinoschisis
  • Snowflake vitreoretinal degeneration

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Ophthalmology
  • Genetics(clinical)


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