Medullary carcinoma of thyroid
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Medullary carcinoma of thyroid

Definition

Medullary carcinoma of the thyroid is cancer of the thyroid gland that starts in cells that release a hormone called calcitonin. Such cells are called "C" cells.

Alternative Names

Thyroid - medullary carcinoma; Cancer - thyroid (medullary carcinoma); MTC

Causes

The cause of medullary carcinoma of the thyroid (MTC) is unknown.

Unlike other types of thyroid cancer, MTC is less likely to be caused by radiation therapy to the neck given to treat other cancers during childhood.

There are two forms of MTC:

  • Sporadic MTC, which does not run in families. Most MTCs are sporadic. This form mainly affects older adults.
  • Inherited MTC runs in families.

You have an increased risk of this type of cancer if you have:

Other types of thyroid cancer include:

Symptoms

  • Breathing problems due to narrowing of airways
  • Cough
  • Cough with blood
  • Diarrhea
  • Goiter (enlarged thyroid)
  • Lump on thyroid gland

Exams and Tests

The health care provider will perform a physical exam. Lymph nodes in the neck may be swollen. Thyroid function tests are usually normal. However, an examination of the thyroid may reveal single or multiple nodules (lumps).

Other tests that may be used to diagnose MTC may include:

Patients with MTC should be checked for certain other tumors, especially pheochromocytoma.

Treatment

Treatment involves surgery to remove the thyroid gland and surrounding lymph nodes. Because this is an uncommon tumor, surgery should be performed by a surgeon who is familiar with this type of cancer.

Chemotherapy and radiation do not work very well for this type of cancer. Radiation is used in some patients after surgery. There are a number of new treatments currently being investigated in clinical trials.

Outlook (Prognosis)

Approximately 86% of those with medullary carcinoma of the thyroid live at least 5 years after diagnosis. The 10-year survival rate is 65%.

Possible Complications

Complications may include:

  • Cancer spreads to other areas of the body
  • Parathyroid glands are accidentally removed during surgery

When to Contact a Medical Professional

Call your health care provider if you have symptoms of medullary carcinoma of the thyroid.

Prevention

Prevention may not be possible. However, being aware of your risk factors, especially your family history, may allow for early diagnosis and treatment. There are some recommendations regarding removing the thyroid gland in people who have a very strong family history of MTC. You should carefully discuss this option with a doctor who is very familiar with the disease.

References

Ladenson P, Kim M. Thyroid. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 244.

National Comprehensive Cancer Network. NCCN Guidelines in Oncology 2010: Thyroid Cancer. Version 1.2010.


Review Date: 3/22/2012
Reviewed By: Shehzad Topiwala, MD, Chief Consultant Endocrinology, Premier Medical Associates, The Villages, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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