Hyperthyroidism is a multisystemic disease that results in death if left untreated. Urine specific gravity is the best indication of renal function in hyperthyroid cats. ~(131)I is the gold standard of treatment for feline hyperthyroid ism. Hyperthyroidism is the most common endocrine disease in middle-aged and geriatric cats. In 99% of cases, a benign tumor (adenoma) in the thyroid gland is responsible for the disease and causes systemic problems that eventually result in death if left untreated. Some possible risk factors include diet, environment, and genetics. Medical, surgical, and radioactive iodine treatment are available with varying prognoses.
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