Feline hyperthyroidism

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Hyperthyroidism is a disorder resulting from excessive circulating concentrations of the active thyroid hormones triiodothyronine (T3) and/or thyroxine (T4). It has become the most endocrine disorder of cats and a disease frequently diagnosed in small animal practice. This chapters looks at aetiology, clinical features, diagnosis and treatment.

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10.2 Hyperthyroid 11-year-old Domestic Shorthair cat, showing evidence of weight loss and an anxious facial expression . (Reproduced with permission from )
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10.3 Coat changes in hyperthyroid cats. A 13-year-old Russian Blue with extensive matting. A 14-year-old pedigree Domestic Longhair with evidence of alopecia.
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10.9 The progressive decline in serum alanine aminotransferase (ALT) concentrations in a series of hyperthyroid cats that became euthyroid with carbimazole at a dose of 5 mg/cat q8h. (Reproduced and modified with permission from )
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10.10 Appearance of bilateral thyroid lobe W°lUv enlargement at the time of surgery. The external parathyroid glands are easily visualized as small spherical pale glands at the cranial pole of each thyroid lobe.
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10.11 Unilateral and bilateral thyroid lobe involvement, as detected by thyroid imaging using pertechnetate.
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10.12 Intracapsular thyroidectomy: The thyroid capsule is incised and the thyroid lobe removed. For the modified intracapsular technique the capsule is subsequently excised.
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10.13 Extracapsular thyroidectomy: The thyroid lobe and capsule are removed whilst preserving vascular supply to the external parathyroid glands. For the modified technique, bipolar cautery is used instead of ligatures.
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10.14 Appearance of a pertechnetate scan in thyroid carcinoma with multiple areas of uptake. The same gland as visualized at the time of surgery.
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