Thyroid

Thyroid(thyroid gland, 갑상샘, 갑상선)

Normal size

• newborn: 18 to 20 mm long, AP diameter of 8 to 9 mm.
• 1 year of age, the mean length is 25 mm and AP diameter is 12 to 15 mm.
• Adult: the mean length is approximately 40 to 60 mm, with mean AP diameter of 13 to 18 mm.
  • The mean thickness of the isthmus is 4 to 6 mm

Pyramidal lobe

• From 10% to 40% of normal patients have a small thyroid (pyramidal) lobe arising superiorly from the isthmus and lying in front of the thyroid cartilage.

Ectopic thyroid

• lingual thyroid: 가장 흔함.
• mediastinal thyroid: mediastinal mass로 나타남

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