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Iris Hyperpigmentation in Cats: Progression, Globe Retention and Long-Term Survival
Elizabeth N Gregorio1, Mary E Lassaline1, Elaine Holt1
1School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Veterinary Ophthalmology
|June 20, 2026
Summary
Long-term survival in cats with iris hyperpigmentation does not significantly differ whether the globe is retained or enucleated. This study suggests early enucleation may not impact feline diffuse iris melanoma outcomes.
Area of Science:
- Ophthalmology
- Veterinary Medicine
- Oncology
Background:
- Iris hyperpigmentation is a common condition in cats.
- Feline diffuse iris melanoma (FDIM) is a potentially aggressive intraocular tumor.
- Understanding the prognosis for cats with iris hyperpigmentation is crucial for treatment decisions.
Purpose of the Study:
- To evaluate the progression of iris hyperpigmentation.
- To assess globe retention rates in affected cats.
- To determine long-term survival outcomes for cats diagnosed with iris hyperpigmentation.
Main Methods:
- Retrospective review of medical records (2010-2022) for signalment and diagnosis.
- Owner surveys to gather data on progression, globe retention, and survival.
- Statistical analysis comparing outcomes between enucleated and non-enucleated cats.
Main Results:
- Ninety-two cats were included; 22% underwent enucleation, confirmed as FDIM.
- Follow-up data from 39% of cats showed 61% were enucleated by the survey time.
- No significant difference in survival rates or mean survival time was found between enucleated and non-enucleated cats.
Conclusions:
- Long-term survival for cats with iris hyperpigmentation appears similar regardless of early enucleation.
- Progression of iris pigmentation was noted in some non-enucleated cats.
- Further research may clarify the optimal management strategy for feline iris hyperpigmentation and FDIM.
