Irregular pupil shape in cats7/31/2023 ![]() This is painful and may feel similar to a migraine. When the drainage angle becomes clogged, it can lead to fluid backup in the eye and cause increased pressures, known as glaucoma. Presence of free-floating pigmented cells within the anterior chamber.Development of dyscoria (abnormal pupil shape).Whether pigment extends into the iridocorneal (drainage) angle.Rate of progression (quick progression is more concerning).Some patients are candidates for sampling of the mass prior to enucleation (either with an aspirate or biopsy), although this creates a significant amount of inflammation within the eye, and is often not worth the risk.Ĭharacteristics of intraocular pigmented masses that often raise concern for a more malignant process include: There are several characteristics that veterinary ophthalmologists use to try and differentiate the two conditions however, the only way to definitively diagnose a lesion is via biopsy (usually obtained by removal of the eye). The difficulty with these diseases is determining at which point the benign melanosis changes to the malignant melanoma. Feline iris melanosis is generally a benign change that should be monitored closely, while uveal melanoma is a malignant tumor, usually of the iris, that can be detrimental to the eye (causing inflammation and glaucoma) and has the potential to metastasize (spread to other parts of the body). It is difficult to differentiate a benign freckle from a potentially malignant melanoma in the iris of a cat.
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