Merck Manual

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Squamous cell carcinoma, nictitating membrane, horse
Squamous cell carcinoma, nictitating membrane, horse

This tumor is usually treated by complete excision of the nictitans. The surgical site should be closely inspected and probed for deeper infiltration of the tumor into the medial orbit.

Courtesy of K. Gelatt.

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Ocular Neoplasia in Horses