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Reese, Sven ORCID: 0000-0002-4605-9791; Büchler, F.; Kraft, W. (2001): Die sonographische Schilddrüsenuntersuchung bei der Katze. In: Tierärztliche Praxis / K, Kleintiere, Vol. 29, No. 3: pp. 184-190
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Sonography was performed in 18 healthy and 48 hyperthyroid cats. Thyroid volume was calculated using the prolate ellipsoid method. Whereas the thyroid glands of healthy cats could merely be demonstrated using 12 and 13 MHz transducers, the enlarged thyroid glands of hyperthyroid cats were already visible with 8 MHz-transducers. The average volume of a physiological thyroid lobe was 0.11 +/- 0.05 ml. In older cats the maximum tolerable upper limit is 0.15 ml. In hyperthyroid cats, the volume of the enlarged thyroid lobe was increased five-fold on average with the measured volumes ranging from 0.2 ml to 13 ml. In regard to echotexture, the enlarged thyroid lobes of hyperthyroid cats appeared nonhomogenous with frequent appearance of hypoechogenic nodules and cysts. 65% of the hyperthyroid cats revealed morphologic alterations in both thyroid lobes. In four cats with highly enlarged and nonhomogeneous thyroid robes adenocarcinomas were diagnosed by histopathology. Two of these cats did not show an increased plasma thyroxine level. In conclusion sonography is a useful addition in the diagnostic of thyroid disease in cats.