We were recently involved in a case that required the eye to be removed from a cow. The farmer had noticed a slow growing tumour developing at the corner of the eye over a period of weeks. We took the decision that it was suitable to be surgically removed. A tumour in this position, if left, can encourage flies which, increase the risk of a secondary bacterial infection, bleeding and ulceration. Leaving cancerous tumours to grow, can allow other tumours to develop elsewhere, risking the health of the cow. Due to the location and attachments to local eye structures it would involve taking the tumour along with the eye ball.