An area ratio of thyroid gland to common carotid artery for evaluating the thyroid gland size

Noboru SASAKI; Noriyuki NAGATA; Keitaro MORISHITA; Tatsuyuki OSUGA; Kazuyoshi SASAOKA; Nozomu YOKOYAMA; Hiroshi OHTA; Mitsuyoshi TAKIGUCHI

doi:10.1292/jvms.20-0183

Internal Medicine

An area ratio of thyroid gland to common carotid artery for evaluating the thyroid gland size

Noboru SASAKI, Noriyuki NAGATA, Keitaro MORISHITA, Tatsuyuki OSUGA, Kazuyoshi SASAOKA, Nozomu YOKOYAMA, Hiroshi OHTA, Mitsuyoshi TAKIGUCHI

Author information

Noboru SASAKI
Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo 060-0818, Japan
Noriyuki NAGATA
Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo 060-0818, Japan
Keitaro MORISHITA
Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 10-chome, Kita-ku, Sapporo 060-0819, Japan
Tatsuyuki OSUGA
Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 10-chome, Kita-ku, Sapporo 060-0819, Japan
Kazuyoshi SASAOKA
Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 10-chome, Kita-ku, Sapporo 060-0819, Japan
Nozomu YOKOYAMA
Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 10-chome, Kita-ku, Sapporo 060-0819, Japan
Hiroshi OHTA
Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo 060-0818, Japan
Mitsuyoshi TAKIGUCHI
Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo 060-0818, Japan

Keywords: canine hypothyroidism, non-thyroid illness, thyroid gland, ultrasonography

JOURNAL OPEN ACCESS

2020 Volume 82 Issue 7 Pages 1012-1016

DOI https://doi.org/10.1292/jvms.20-0183

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Abstract

The feasibility of ultrasonographic measurement of thyroid gland area to common carotid artery (TG:CCA) was investigated. Twenty-one healthy, 12 hypothyroid and 18 non-thyroid illness (NTI) dogs were evaluated. The area of thyroid lobe and common carotid artery in right and left sides were measured using the same ultrasonographic images in transverse plane. The average of the right and left ratio was calculated as TG:CCA. The median TG:CCA of 21 healthy dogs was 1.53, and it did not correlate either body weight or age. The median TG:CCA of 12 hypothyroid dogs was 0.81, which was significantly lower than that of 18 NTI dogs (1.81, P<0.001). If the cut off value <1.12 was used, TG:CCA indicated hypothyroidism with a sensitivity of 100%, specificity of 83%, and accuracy of 90%. Our data indicated that TG:CCA was independent of both body weight, which may contribute to consistent measurement of thyroid size. The results of this study suggest that TG:CCA is a promising tool for diagnosing canine hypothyroidism.

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