In horses, tumors of the skin, eye, and genital system are the most frequent and 80% of eye neoplasms are malignant. Neoplasms of the eyelids and conjunctivae are the most frequent ophthalmic tumors in horses; most are either squamous cell carcinoma or sarcoid. Orbital neoplasms are rare and are usually local extensions of eyelid, conjunctiva, or sinus tumors or systemic neoplasms, including lymphosarcoma. Intraocular neoplasms, usually malignant melanomas are rare.
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