Skip Navigation
Genetics Home Reference: your guide to understanding genetic conditions About   Site Map   Contact Us
Home A service of the U.S. National Library of Medicine®
Printer-friendly version
Carney complex

Carney complex

Reviewed January 2010

What is Carney complex?

Carney complex is a disorder characterized by an increased risk of several types of tumors. Affected individuals also usually have changes in skin coloring (pigmentation). Signs and symptoms of this condition commonly begin in the teens or early adulthood.

Individuals with Carney complex are at increased risk of developing noncancerous (benign) tumors called myxomas in the heart (cardiac myxoma) and other parts of the body. Cardiac myxomas may be found in any of the four chambers of the heart and can develop in more than one chamber. These tumors can block the flow of blood through the heart, causing serious complications or sudden death. Myxomas may also develop on the skin and in internal organs. Skin myxomas appear as small bumps on the surface of the skin or as lumps underneath the skin. In Carney complex, myxomas have a tendency to recur after they are removed.

Individuals with Carney complex also develop tumors in hormone-producing (endocrine) glands, such as the adrenal glands located on top of each kidney. People with this condition may develop a specific type of adrenal disease called primary pigmented nodular adrenocortical disease (PPNAD). PPNAD causes the adrenal glands to produce an excess of the hormone cortisol. High levels of cortisol (hypercortisolism) can lead to the development of Cushing syndrome. This syndrome causes weight gain in the face and upper body, slowed growth in children, fragile skin, fatigue, and other health problems.

People with Carney complex may also develop tumors of other endocrine tissues, including the thyroid, testes, and ovaries. A tumor called an adenoma may form in the pituitary gland, which is located at the base of the brain. A pituitary adenoma usually results in the production of too much growth hormone. Excess growth hormone leads to acromegaly, a condition characterized by large hands and feet, arthritis, and "coarse" facial features.

Some people with Carney complex develop a rare tumor called psammomatous melanotic schwannoma. This tumor occurs in specialized cells called Schwann cells, which wrap around and insulate nerves. This tumor is usually benign, but in some cases it can become cancerous (malignant).

Almost all people with Carney complex have areas of unusual skin pigmentation. Brown skin spots called lentigines may appear anywhere on the body but tend to occur around the lips, eyes, or genitalia. In addition, some affected individuals have at least one blue-black mole called a blue nevus.

How common is Carney complex?

Carney complex is a rare disorder; fewer than 750 affected individuals have been identified.

What genes are related to Carney complex?

Mutations in the PRKAR1A gene cause most cases of Carney complex. This gene provides instructions for making one part (subunit) of an enzyme called protein kinase A, which promotes cell growth and division (proliferation). The subunit produced from the PRKAR1A gene, called type 1 alpha, helps control whether protein kinase A is turned on or off.

Most mutations in the PRKAR1A gene that cause Carney complex result in an abnormal type 1 alpha subunit that is quickly broken down (degraded) by the cell. The lack of this subunit causes protein kinase A to be turned on more often than normal, which leads to uncontrolled cell proliferation. The signs and symptoms of Carney complex are related to the unregulated growth of cells in many parts of the body.

Some individuals with Carney complex do not have identified mutations in the PRKAR1A gene. In many of these cases, the disorder is associated with a specific region on the short (p) arm of chromosome 2, designated as 2p16. Researchers have not discovered the gene within this region that is responsible for Carney complex.

Read more about the PRKAR1A gene.

How do people inherit Carney complex?

Carney complex is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In approximately 80 percent of cases, an affected person inherits the mutation from one affected parent. The remaining cases result from new mutations in the gene and occur in people with no history of Carney complex in their family.

Where can I find information about diagnosis or management of Carney complex?

These resources address the diagnosis or management of Carney complex and may include treatment providers.

You might also find information on the diagnosis or management of Carney complex in Educational resources and Patient support.

General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.

To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.

Where can I find additional information about Carney complex?

You may find the following resources about Carney complex helpful. These materials are written for the general public.

You may also be interested in these resources, which are designed for healthcare professionals and researchers.

What other names do people use for Carney complex?

  • Carney Syndrome
  • LAMB - Lentigines, atrial myxoma, mucocutaneous myoma, blue nevus syndrome
  • NAME - Nevi, atrial myxoma, skin myxoma, ephelides syndrome

For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines and How are genetic conditions and genes named? in the Handbook.

What if I still have specific questions about Carney complex?

Where can I find general information about genetic conditions?

What glossary definitions help with understanding Carney complex?

References (8 links)


The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.

Reviewed: January 2010
Published: February 8, 2016