Feline hyperthyroidism

Carmel T. Mooney; Mark E. Peterson

doi:10.22233/9781905319893.10

British Small Animal Veterinary Association , 92 (2012); https://doi.org/10.22233/9781905319893.10

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Feline hyperthyroidism

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Authors: Carmel T. Mooney and Mark E. Peterson
From: BSAVA Manual of Canine and Feline Endocrinology
Item: Chapter 10, pp 92 - 110
DOI: 10.22233/9781905319893.10
Copyright: © 2012 British Small Animal Veterinary Association
Publication Date: January 2012

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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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Figures

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10.2

Hyperthyroid 11-year-old Domestic Shorthair cat, showing evidence of weight loss (a) and an anxious facial expression (b). (Reproduced with permission from Thoday and Mooney, 1992 ) © 2012 British Small Animal Veterinary Association

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10.2 Hyperthyroid 11-year-old Domestic Shorthair cat, showing evidence of weight loss (a) and an anxious facial expression (b). (Reproduced with permission from Thoday and Mooney, 1992 )

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10.3

Coat changes in hyperthyroid cats. (a) A 13-year-old Russian Blue with extensive matting. (b) A 14-year-old pedigree Domestic Longhair with evidence of alopecia. © 2012 British Small Animal Veterinary Association

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10.3 Coat changes in hyperthyroid cats. (a) A 13-year-old Russian Blue with extensive matting. (b) 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 Mooney et al., 1992 ) © 2012 British Small Animal Veterinary Association

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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 Mooney et al., 1992 )

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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. © 2012 British Small Animal Veterinary Association

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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

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10.11 Unilateral (a) and bilateral (b) 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. © 2012 British Small Animal Veterinary Association

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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. © 2012 British Small Animal Veterinary Association

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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

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10.14 (a) Appearance of a pertechnetate scan in thyroid carcinoma with multiple areas of uptake. (b) The same gland as visualized at the time of surgery.