Lipid Definition Lipids are class of naturally-occurring organic compounds that you may know by their common names: fats and oils. A key characteristic of this group of compounds is that they are not soluble in water.
Ultrasound. 1  normal thyroid gland has an homogenous appearance, the capsule may appear as a thin hyperechoic line. 2  each lobe normally measures 4 length: 4-7 cm. depth: <2 cm. 3  volume (excluding isthmus, unless its thickness is > 3mm) 6 10-15 ml for females. 12-18 ml for males.
Findings: The right thyroid lobe measures 4.3 X 1.4 X 1.9 cm, while the left measures 4.7 X 1.3 X 1.5 cm. Thyroid isthmus measures 0.3 cm. Overall throid echogenicity and echo texture are within normal limits. Color Doppler shows an unremarkable flow patatern throughout the thyroid gland. Multiple thyroid nodules are identified.