by Jason Wasserman, MD PhD FRCPC, reviewed on February 19, 2020
The thyroid is a U-shaped gland located in the front of the neck. The normal thyroid gland is divided into right and left lobes that are connected in the middle by the isthmus. Some people also have another small lobe above the isthmus called the pyramidal lobe.
The thyroid gland makes thyroid hormone. Most of the cells in the thyroid gland are called follicular cells. The follicular cells connect together to form small round structures called follicles. Thyroid hormone is stored in a material called colloid which fills the centre of follicles.
Papillary thyroid microcarcinoma is a type of cancer that starts in the thyroid gland. It is part of a group of cancers called papillary thyroid carcinoma. It is called a “microcarcinoma” because it measures less than 1.0 cm in size. To learn more, read our article about papillary thyroid carcinoma.