Normal Thyroid Gland Dimensions in Children: Available References and Data Limitations
What is Available in the Source
The provided fragments contain only point data on thyroid gland dimensions in a 1-year-old child (Textbook of Diagnostic Sonography, 9th Ed., 2023). Complete reference tables by age, as well as volume norms based on body surface area (BSA) according to WHO criteria, are absent from the fragments and are therefore marked as [verify].
Thyroid Lobe Dimensions
| Parameter | At 1 Year (Mean) | In Adults (Normal) |
|---|---|---|
| Length | 25 mm | 40–60 mm |
| Anteroposterior (AP) Dimension | 12–15 mm | 20–30 mm |
| Width | 10–15 mm | 15–20 mm |
The lobes are normally equal in size. The isthmus is the smallest part of the gland; in adults, its AP dimension is 4–6 mm (source: Hagen-Ansert, 2023).
Criteria for Gland Enlargement
According to the source, the gland is considered enlarged when the AP dimension of the lobe exceeds 20 mm and the isthmus is 10 mm or greater. Due to shape variability, thyroid volume is recognized as a more informative indicator of enlargement.
Limitations
References for age groups older than 1 year, as well as norms for thyroid volume based on body surface area according to WHO criteria, are not presented in the provided fragments — these should be [verified] against primary normative documents.
Frequently asked questions
What is the normal size of the thyroid lobe in a 1-year-old child?
The mean length is 25 mm, the anteroposterior dimension is 12–15 mm, and the width is 10–15 mm (Hagen-Ansert, 2023).
When is the thyroid gland considered enlarged?
When the AP dimension of the lobe exceeds 20 mm and the isthmus measures 10 mm or greater.
Which parameter is preferred for assessing gland enlargement?
Due to shape variations, thyroid volume is more useful than linear dimensions.
Are volume references based on body surface area (WHO) available in the fragments?
No. Volume norms based on BSA and WHO criteria are absent from the source — these must be [verified].