Pre- And Posttreatment Ultrasonography of the Thyroid Gland in Hyperthyroid Cats

Abstract

Ultrasonography is useful for assessing the morphology of the thyroid gland in hyperthyroid cats. Our aim was to describe the ultrasonographic changes of the thyroid gland in hyperthyroid cats after 131I therapy. Ultrasonography was performed in 15 hyperthyroid cats at initial presentation and 6 months after 131I using a multifrequency linear transducer set at 12 MHz. The following criteria were evaluated: length, width, height, volume, shape, homogeneity, and vascularity, using Power Doppler. Pretreatment, 10 cats had bilaterally abnormal thyroid lobes, four cats one abnormal lobe with the contralateral lobe being normal or reduced in size, and one cat with one normal lobe and one lobe not visible. Six months after 131I therapy, there was a reduction in median volume from 819 to 210 mm3, reduced rounding, reduced heterogeneity, and decreased vascularity. In conclusion, ultrasonography may be used to monitor thyroid changes in order to assess 131I treatment response. Further studies are necessary to determine whether ultrasonography could contribute to the detection of a relapsing course of hyperthyroidism.

Quantitative Pertechnetate Thyroid Scintigraphy and the Ultrasonographic Appearance of the Thyroid Gland in Clinically Normal Horses

“…Lobe volume was calculated using the formula for a prolate concentrations were between 6.5 and 28.4 nmol/l). 90 There was a significant reduction in mean thyroid lobe volume over time (from 819 to 210 mm 3 ). This corresponded to a 75% reduction in volume.…”

“…90,91 In one study sonography was compared to pertechnetate thyroid scintigraphy in a population of cats with hyperthyroidism. 91 The study included 14 hyperthyroid cats and six normal cats as controls.…”

“…91 The sonographic appearance of the thyroid gland in a group of hyperthyroid cats before and after treatment with 131 I has recently been reported. 90 Fifteen client-owned cats were used in the study. At first presentation mean serum total T 4 was 125.9 nmol/l with concentrations all concentrations being between 52.6 and 193.5 nmol/l (normal reference interval: 10-50 nmol/l).…”

ANIMAL MODELS OF DISEASE: Feline hyperthyroidism: an animal model for toxic nodular goiter

“…Several imaging methods are available for thyroid imaging, including scintigraphy (with radioiodine or technetium; Daniel & Neelis 2014, Peterson & Broome 2014b, ultrasonography (Wisner 1994, Barberet et al 2010, computed tomography scans (Drost et al 2004(Drost et al , 2006, or magnetic resonance imaging (Hofmeister et al 2001, Barthez et al 2006.…”

Evaluation of Prevalence of the Types of Thyroid Disorders Using Ultrasound and Pathology of One Humped Camel (Camelus dromedarius)

“…Ultrasonography and pathology of the thyroid gland in animals such as sheep [6,7] , goats and cows [8] , cat [9] , dogs [6] and horse [7] as well as in humans [10] have been studied.…”