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Feline Uveal Melanoma Review: Our Current Understanding and Recent Research Advances
David Kayes1, Benjamin Blacklock1
1The Ophthalmology Department, The University of Edinburgh Hospital for Small Animals (HfSA), Royal (Dick) School of Veterinary Studies (R(D)SVS), Easter Bush Campus, Midlothian EH25 9RG, UK.
Veterinary Sciences
|February 24, 2022
Summary
Feline diffuse iris melanoma (FDIM) is a common feline ocular tumor. Differentiating benign iris melanosis from malignant FDIM requires histology, posing a challenge due to variable tumor behavior and unpredictable progression.
Area of Science:
- Veterinary Ophthalmology
- Oncology
- Feline Medicine
Background:
- Melanocytic neoplasia is the most frequent ocular tumor in cats, comprising 67% of primary ocular neoplasms.
- Feline diffuse iris melanoma (FDIM) is the predominant type of ocular melanocytic neoplasia.
- Iris melanosis, a precursor lesion, can progress to FDIM through stromal infiltration and cellular changes.
Purpose of the Study:
- To review current knowledge on feline diffuse iris melanoma (FDIM).
- To highlight the challenges in differentiating benign iris melanosis from malignant FDIM.
- To discuss the variable and unpredictable behavior of FDIM in cats.
Main Methods:
- Review of existing literature on feline ocular melanocytic neoplasia.
- Analysis of histopathological criteria for distinguishing iris melanosis from FDIM.
- Discussion of clinical presentation and behavior of FDIM.
Main Results:
- Histologic examination is the sole method for differentiating iris melanosis from FDIM.
- FDIM exhibits variable behavior, ranging from static to aggressive, impacting prognosis.
- Metastatic disease significantly affects feline life expectancy.
Conclusions:
- Accurate diagnosis of FDIM relies on histopathology.
- The unpredictable nature of FDIM complicates treatment and management strategies.
- Further research is needed to improve in vivo diagnosis and predict FDIM behavior.
