Feline Acromegaly: Welfare Through Diagnosis and Management

Acromegaly from a pituitary tumor causes poorly controlled diabetes and organ enlargement in cats — recognition and treatment improves welfare significantly.

Key Facts

• Feline acromegaly is caused by a growth-hormone-secreting pituitary adenoma
• It is now recognized as a common cause of poorly controlled diabetes mellitus in cats
• Signs include progressive facial coarsening, weight gain despite diabetes, and insulin resistance
• Radiation therapy targeting the pituitary tumor can achieve diabetes remission in many cats
• Without treatment, progressive organ enlargement causes heart failure and neurological signs

Welfare Considerations

Feline acromegaly causes welfare harm through two main pathways: the poorly controlled diabetes resulting from growth hormone insulin antagonism, and the direct effects of organ enlargement including cardiomegaly, renal enlargement, and eventually pituitary tumor compression of the brain. Cats with acromegaly require very high insulin doses to achieve any glycemic control — the associated stress of frequent injections and persistent hyperglycemia causes chronic welfare compromise. Radiation therapy of the pituitary adenoma is increasingly available and can achieve dramatic improvement: insulin requirements fall, glycemic control improves, and some cats achieve diabetic remission. Early diagnosis through screening poorly controlled diabetic cats with IGF-1 measurement improves welfare outcomes.

What You Can Do

• Request IGF-1 measurement in any diabetic cat requiring more than 2-3 units of insulin per injection
• Pursue pituitary MRI for cats with elevated IGF-1 to confirm acromegaly diagnosis
• Discuss radiation therapy options with a veterinary oncologist — results can be dramatic
• Maintain meticulous blood glucose monitoring while adjusting insulin as tumor therapy takes effect
• Monitor for cardiac disease — echocardiography annually in acromegalic cats