Feline hypothyroidism

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Iatrogenic, congenital and spontaneous adult-onset hypothyroidism have all been described in cats, albeit rarely. This chapter focuses on aetiology, clinical features, diagnosis and treatment.

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11.2 This 5-year-old male neutered Devon Rex cat was presented with a history of lethargy, mental dullness and inappetence. The cat also had diabetes mellitus. This patient had a very low circulating total thyroxine concentration, as well as an increased canine TSH concentration, confirming primary hypothyroidism.There was a seborrhoeic hair coat that was easily epilated;note the bilateral ceruminous otitis. (Courtesy of E. Mercier and S. Daminet) The same patient (on the left), one year before the onset of clinical signs of hypothyroidism.
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11.3 Ventral view of a thyroid scintigraphic scan from the cat in Figure 11.2 . Note the uptake of pertechnetate in the salivary glands (arrowed) and the absence of uptake in the cervical (thyroid) region. (Courtesy of K. Peremans) For illustration purposes, this figure shows the increased uptake of pertechnetate visible in the thyroid glands of a hyperthyroid cat (arrowed). (Courtesy of K. Peremans)
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