ANYONE involved in keeping horses will appreciate the array of medical and surgical conditions which they can develop. One such condition is a type of ovarian tumour known as a Granulosa Cell Tumour (GCT).

These tumours are slow-growing and benign, which means they do not spread around the body. They can, however, produce a number of hormones which can result in an array of behavioural or reproductive issues in affected mares. Occasionally, tumours up to 40cm in size can be found in mares displaying no outward symptoms at all!