Document Type: Original Article

Authors

1 Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.

2 Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.

3 Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran.

Abstract

Objective: to compare the estimated thyroid volume, as determined by two-dimensional (2D) and three-dimensional (3D) ultrasonography, with real volume.
Design: Descriptive Study
Animals: A total of 7 mixed breed dogs
Procedures: On 2D ultrasound, the thyroid volume is estimated by the ellipsoid equation and on 3D ultrasound; it is estimated by outlining the boundaries of the thyroid lobe in image planes and then calculated with the inbuilt software. The real volume was measured after Euthanasia. Correlation between actual and estimated size were computed by using statistical software. All of the dogs must be euthanized because of clinically end-stage condition. 
Results: The study demonstrates that there is a high agreement between 3D ultrasound and real volume measured by graduated cylinder method (r=0.97, P<0.000).
Conclusion and Clinical Relevance: Evaluation of the size of thyroid gland is useful in diagnosis of several situations and in follow-ups monitoring. Ultrasonography is supposed to provide a reliable estimate of thyroid volume. In this study, 3D ultrasound was a useful image method in the estimating of canine thyroid volume.

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