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Each lobe measures approximately 4 cm in length. The average weight is 25 g; this is slightly higher in females and may increase during menstruation and pregnancy 7. The parathyroid glands lie posteromedially and are sometimes intracapsular.
The normal thyroid gland size on ultrasound varies depending on age, sex, and body mass index. The normal adult thyroid volume is approximately 10-15cc, with each lobe measuring about 4-6 cm in length and 2-3 cm in width. Each lobe’s anterior-posterior (AP) dimension is usually less than 2 cm.
Thyroid Ultrasonography Normal Anatomy Lobes are oval shaped with rounded superior pole and elongated inferior pole Lobe dimensions may vary greatly 4-6cm in length lobe thickness (AP dimension) ≤ 2cm Normal adult thyroid volume is ~10-15cc
Variations in Lobe Size and Shape:The size, shape, and position of the thyroid gland can vary among individuals. Some people may have asymmetrical lobes or lobes that extend farther laterally or inferiorly. ... Thyroid hormones are essential for normal growth and development, particularly during fetal life, childhood, and adolescence.
The limits of normal thyroid volume (excluding isthmus, unless its thickness is >3 mm) are 10-15 ml for females and 12-18 ml for males. Accurate evaluation of thyroid volume is crucial for diagnosing goiter and monitoring thyroid diseases, particularly in pediatrics.
The thyroid is a small gland, measuring about 2 inches (5 centimeters) across, that is located just under the skin in the neck. The two halves (lobes) of the gland are connected in the middle (called the isthmus), giving the thyroid gland the shape of a bow tie. Normally, the thyroid gland cannot be seen and can barely be felt.
In healthy adults without iodine deficiency, a normal thyroid gland is approximately 4 to 4.8 x 1 to 1.8 x 0.8 to 1.6 cm in size, with a mean sonographic volume of 7 to 10 mL and weight of 10 to 20 grams [1,2].
The height or length (L) of the thyroid lobe is typically 4–5 cm. The thickness (anterior-posterior diameter) of the isthmus is usually less than 5 mm. In most patients the normal lobes are quite similar in size; however, rarely there will be a rather undeveloped lobe unilaterally.
SIZE AND LOCATION. In healthy adults without iodine deficiency, a normal thyroid gland is approximately 4 to 4.8 x 1 to 1.8 x 0.8 to 1.6 cm in size, with a mean sonographic volume of 7 to 10 mL and weight of 10 to 20 grams [2-4].
Normal Thyroid Appearance. A healthy thyroid typically appears as a butterfly-shaped organ with two lobes joined by a narrow band of tissue. In a normal thyroid ultrasound, the gland should have a uniform texture and no visible lumps or bumps.