Normal Anatomy and Sonography of Thyroid

The thyroid gland is an H-shaped organ composed of two lobes joined by a narrow isthmus located just below the laryngeal cartilages. The normal thyroid weighs approximately 15 to 25 g, with each lobe 4 to 6 cm in length and 1.3 to 1.8 cm in thickness. The isthmus measures less than 4 to 5 mm.

Thyroid cancer can cause any of the following signs or symptoms:

  • A lump in the neck, sometimes growing quickly.
  • Swelling in the neck.
  • Pain in the front of the neck, sometimes going up to the ears.
  • Hoarseness or other voice changes that do not go away.
  • Trouble swallowing.
  • Trouble breathing.
Normal Anatomy and Sonography of Thyroid

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