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Seen most commonly in the cat. Elderly cats are affected with the average age of onset being 12-13 years.
''Clinical signs'':
*Weight loss despite polyphagia
*Increased activity, nervousness (approximately 10% will show apathy)
*Polyuria and polydipsia
*Heat intolerance, panting
*Tachycardia >240 bpm
*Poor coat, matted and unkempt
*Palpable thyroid mass often present
Often see a [[Hypertrophic Cardiomyopathy|hypertrophic cardiomyopathy]] due to chronically increased heart rate and activity.
[[Image:thyroid adenoma.jpg|right|thumb|125px|<small><center>'''Thyroid adenoma'''. Courtesy of T. Scase</center></small>]]
''Aetiopathogenesis'':
>98% are a functional adenoma of the thyroid gland and many will be palpable.
''Treatment:''
Surgical removal of the affected thyroid gland(s). If bilateral it is important to preserve at least one parathyroid gland to maintain calcium homeostasis.
Medical treatment:
*'''Carbamizole''': Interferes with thyroid hormone synthesis.
*'''Radioactive iodine''' therapy. Useful for intrathoracic thyroid nodules.
[[Category:To Do - Clinical]][[Category:Endocrine Diseases - Cat]]
[[Category:To Do - Clinical]][[Category:Endocrine Diseases - Cat]]
[[Category:Thyroid Gland - Pathology]]