Do thyroid ultrasonographic features change according to age in euthyroid dogs?

Area of Science:

• Veterinary medicine
• Diagnostic imaging
• Canine endocrinology

Background:

• Thyroid gland ultrasonography is a key diagnostic tool in veterinary medicine.
• Age-related changes in canine thyroid imaging are not well-documented.
• Understanding these changes is crucial for accurate diagnosis.

Purpose of the Study:

• To evaluate ultrasonographic patterns of the thyroid gland in dogs across different age groups.
• To identify age-specific alterations in thyroid imaging features.
• To establish baseline ultrasonographic data for canine thyroids.

Main Methods:

• Ultrasound examination of the thyroid gland in 30 healthy, euthyroid dogs (10 young, 10 adult, 10 elderly).
• Assessment of thyroid lobe shape, size, echogenicity, and echotexture.
• Thyroid volume calculation using the ellipsoid formula; echogenicity/echotexture analyzed via histogram.

Main Results:

• Young dogs showed a trend towards higher thyroid volume compared to adult and older dogs.
• Thyroid lobe height in the longitudinal plane was significantly greater in young dogs.
• No significant differences in echotexture or echogenicity were observed between age groups, though older dogs had greater echogenicity.

Conclusions:

• Age is a significant factor influencing thyroid volume and lobe height in canine ultrasound assessments.
• These findings provide valuable reference data for interpreting thyroid ultrasonography in dogs of various ages.
• Further research may elucidate the clinical significance of age-related ultrasonographic variations.