There are different types of
thyroid cancer. They are based on what
the cells look like under a microscope. Your treatment will depend on which
type of thyroid cancer you have.
Papillary thyroid cancer (PTC). This is the most common type of thyroid cancer. PTC starts in cells called
follicular cells and usually is only found in one lobe of the thyroid. Although
PTC usually grows very slowly, it often spreads to lymph nodes in the neck. It can also spread to the lungs and bones.
Follicular thyroid cancer (FTC). This is the second most common type of thyroid cancer. It is usually found in
countries where people do not get enough iodine from food. FTC can spread to the lungs.
Medullary thyroid cancer (MTC). Medullary thyroid cancer is less common. By the time it is diagnosed, it may already have spread to the lymph nodes, liver,
or lungs. There are two types of MTC: sporadic and familial.
Sporadic MTC occurs
mostly in adults, does not occur in families, and usually affects only one lobe
of the thyroid gland.
Familial MTC can
develop during early childhood, occurs in families, and can spread to other
parts of the body. There are three types of familial thyroid cancer, called MEN
2a, MEN 2b, and FMTC (familial medullary thyroid cancer). Genetic blood tests
can be used to identify people who are at risk for developing familial
medullary cancer. If
genetic testing shows a gene problem called RET
mutation, most experts suggests surgery to remove the thyroid to help prevent
future medullary thyroid cancer.
Anaplastic carcinoma. This
is a very rare and aggressive form of thyroid cancer. By the time it is diagnosed,
it usually has spread to the neck and other parts of the body. It grows rapidly
and is the most fatal form of thyroid cancer.
Thyroid lymphoma. This very rare type of
lymphoma starts in the thyroid gland and causes it to