Page 1013 - The Veterinary Care of the Horse
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as pigmented masses (Figure 21.28). These can be differentiated from large corpora nigra by
ultrasound examination. They also occur in the eyelids.
VetBooks.ir
Figure 21.28 Iris melanoma
TREATMENT OPTIONS
These include the following.
• Monitoring the tumour and leaving it alone.
• Cimetidine. This is a drug that is given by mouth for a period of 3–6 months. The
treatment is expensive and is not universally successful. However, a reduction in size or
disappearance of the tumour occurs in some cases.
• Surgical removal of small tumours on the eyelids.
• Injection of the chemotherapy drug cisplatin into eyelid tumours.
• Surgical removal of the eye if the tumour is causing discomfort or justifies this radical
