Introduction
Background
Carney complex (CNC) is a familial multiple neoplasia and lentiginosis syndrome. Historically, the complex involved the association of the following conditions: (1) primary pigmented nodular adrenocortical disease (PPNAD), a pituitary-independent, primary adrenal form of hypercortisolism; (2) lentigines, ephelides, and blue nevi of the skin and mucosae; and (3) a variety of nonendocrine and endocrine tumors. The latter include myxomas of the skin, heart, breast, and other sites; psammomatous melanotic schwannoma; growth hormone–producing pituitary adenoma; testicular Sertoli-cell tumor; and, possibly, other benign and malignant neoplasms and conditions, including tumors of the thyroid gland and ductal adenoma of the breast and acromegaly due to somatomammotroph hyperplasia and adenoma not dependent on growth hormone–releasing hormone.
Although the existence of the complex as an unrecognized inherited syndrome was first suggested in 1985, combinations of several components of the syndrome and their familial occurrence were reported earlier.
The pathologic findings of multiple, small, pigmented adrenocortical nodules and internodular cortical atrophy were described as early as 1949 in the adrenal glands of children and young adults with Cushing syndrome. In 1980, Atherton and colleagues1 described a patient with a vast number of macular pigmented lesions on the skin, which involved the lips; myxoid neurofibroma; and domed blue nevi. Echocardiograms revealed dense echoes arising from the space between the mitral leaflets; these findings were consistent with the histologic features of a myxoma. Atherton suggested the term nevi, atrial myxoma, myxoid neurofibromas, and ephelides (NAME) syndrome.
Rhodes and colleagues2 then described a similar condition for which the term lentigines, atrial myxomas, and blue nevi (LAMB) syndrome was suggested.
Carney3 conducted a review of cases in 40 patients with cardiac myxomas. He found that many of these patients also had multiple pigmented lesions (lentigines and several types of nevi), which affected the lips, as well as PPNAD, which presented as Cushing syndrome. Some of these patients also presented with testicular tumors, fibroadenomas, and pituitary adenomas. He concluded that these rare conditions were unlikely to occur together by chance and that they represented a unique syndrome. Endocrine overactivity is also part of this syndrome.4 In fact, corticotropin hormone–independent Cushing syndrome due to primary pigmented nodular adrenocortical disease is an important syndrome characteristic.
The eMedicine article Carney Complex also may be of interest.
Pathophysiology
The Carney myxoma-endocrine complex is believed to exist in at least 2 genetically distinct forms: One form can be mapped to chromosome 17, and the other, to chromosome 2. The chromosome 17 form, designated CNC type I, is due to mutations in the PRKAR1A gene. Further research is needed to delineate the exact genetic mutations in CNC type II.
CNC genes are associated with genomic instability as cell lines established from CNC tumors accumulate chromosomal changes, including telomeric associations (tas) and dicentric chromosomes. Myxomas in CNC show a high rate of apoptosis, in concordance with the cytogenetic abnormalities in these tumors. Both PPNAD (a primary bilateral adrenal disorder leading to Cushing syndrome) and myxomatous tumors from patients with CNC stain positive for synaptophysin, a neuroendocrine (NE) marker, and the lesions have NE properties on electron microscopy.
An inherited disposition to cardiac myxoma development is seen in these CNC patients.5 They have a mutation in the PRKAR1A gene, which encodes the regulatory R1alpha subunit of protein kinase A—a significant component of the cyclic adenosine monophosphate (cAMP) signaling pathway. Genetically engineered mutant Prkar1a mouse models also show a tendency to develop tumors. PPNAD, a rare cause of corticotropin-independent Cushing syndrome, may be part of CNC. A small intronic deletion of the PRKAR1A gene is a low-penetrance cause of mainly PPNAD; it is the first PRKAR1A genetic defect to have an association with a specific phenotype.6 PPNAD and pituitary adenoma in a boy with sporadic CNC was found to be due to a novel, de novo paternal PRKAR1A mutation (R96X).7
Frequency
United States
Cardiac myxomas are the most common primary cardiac tumor in the general population and occur with a frequency of 7 cases per 10,000 individuals. Myxomas occurring as part of CNC account for 7% of all cardiac myxomas.
International
More than 150 patients have been identified as having Carney syndrome since its recognition as a complex in 1985. Cases in persons with only limited involvement may not be reported. The syndrome is distributed worldwide.
Mortality/Morbidity
- Cardiac myxomas account for a mortality rate of 25% in patients with this syndrome.
- Cardiac myxomas are a silent killer, causing major disability with its embolic capacity and even sudden death.
- The psammomatous melanotic schwannomas are typically benign; however, as many as 10% of cases can metastasize.
Race
Most patients who are affected with CNC are white, although the disease has been described in blacks.
Sex
Males and females are affected equally.
Age
The mean patient age at diagnosis is 10-20 years.
Clinical
History
Cutaneous manifestations are a major clue in the diagnosis of this condition. These manifestations include Cushing syndrome and skin changes associated with pigmentation.
- Symptoms of Cushing syndrome may develop in young patients.
- The skin is fragile and thin.
- Patients bruise easily and heal poorly.
- The bones are weakened, and routine activities such as bending, lifting, or rising from a chair may lead to backaches and rib and spinal column fractures.
- Severe fatigue, muscle weakness, high blood pressure, and high blood sugar levels may be present.
- Irritability, anxiety, and depression are also common.
- Women may have menstrual periods that become irregular or stop.
- Men have decreased fertility with a diminished or absent desire for sex.
- Symptoms of a prolactin-secreting tumor include hypogonadism (eg, amenorrhea, impotence) associated with symptoms of increased prolactin levels (eg, galactorrhea) in female patients.
- Symptoms of acromegaly include headaches and visual abnormalities.
- Symptoms of hyperparathyroidism include fatigue, anemia, muscle weakness, joint pain, constipation with nausea, frequent urination (sometimes bloody), mood change with confusion, abdominal pain due to ulcers, flank or back pain due to stones, bone pain due to bone erosions or fractures, and hypertension.
- Atrial myxomas may create ball-valve obstructions that cause unexpected syncopal attacks, cardiac insufficiency, and sudden death in apparently healthy young children and adults.
- Right-sided myxomas with extramedullary hematopoiesis and ossification in CNC has been described in a patient who also had a tiny eyelid cutaneous myxoma, multiple hypoechoic thyroid follicular adenomas, and multiple small testicular tumors.8
Physical
Myxomas recur in approximately 12-22% of familial cases and in about 1-2% of sporadic cases.
- Atrial myxomas
- On physical examination, an accentuated first heart sound can be appreciated in patients with cardiac myxomas.
- In adults, myxomas are the most common primary tumor of the heart. They arise in any of the 4 chambers or on the heart valves; however, about 90% are located in the atria. Myxomas in the atria have a left-to-right ratio of approximately 4:1.
- Myxomas are mostly single and rarely multiple in several chambers.
- Tumors can be 1-10 cm or larger in diameter.
- The tumors can be sessile or pedunculated. In addition, the pedunculated form of atrial myxomas is often sufficiently mobile to move into or sometimes through the atrioventricular valves during diastole. Sometimes, such mobility exerts a wrecking-ball effect on the valve leaflets.
- Multiple nevi, diffuse facial lentigines, and mucosal labial pigmentation
- The classic presentation is a spotty pigmentation on the face, the chest and shoulders, and the vermilion border of the lips and conjunctiva.
- The pigmentation can be tan or dark brown to black.
- The lesions can be irregularly shaped or sharply delineated, and they can be small or several millimeters in diameter.
- Subcutaneous myxoid neurofibromas and mammary fibroadenosis
- Cutaneous myxomas have a predilection for the eyelids and external ear canals, although they may affect any part of the skin.
- The mammary myxoid fibroadenomas in the complex are often multiple and bilateral; these fibroadenomas are an unusual finding in an otherwise normal breast.
- Signs of acromegaly
- Macroglossia may be present.
- Prominent jaw and frontal bossing may be observed.
- The patient may have large spadelike hands.
- Skin tags may be observed.
- Hyperhidrosis may occur.
- Signs of Cushing syndrome
- The skin is fragile and thin.
- Patients bruise easily and heal poorly.
- Purplish pink stretch marks are noted on the abdomen, thighs, buttocks, arms, and breasts.
- Upper-body obesity, a rounded face, increased fat around the neck, and thin arms and legs are observed.
- Children tend to be obese, with slowed growth rates.
- Women usually have excessive hair growth on their face, neck, chest, abdomen, and thighs.
- Endocrine involvement in CNC also includes 3 types of testicular tumors: large-cell calcifying Sertoli-cell tumor (one of the rarest testicular neoplasms), adrenocortical rests, and Leydig-cell tumor.
- These tumors appear with testicular masses, and about one third of affected male patients have them.
- Large-cell calcifying Sertoli-cell tumors may also appear as bilateral masses. They can also secrete estrogens, resulting in precocious puberty, gynecomastia, or both.
- As many as 75% of patients with CNC may have multiple thyroid nodules.
- The nodules can appear as a goiter or thyroid mass when palpated on physical examination.
- Patients can also present with symptoms of hyperthyroidism or hypothyroidism.
- Psammomatous melanotic schwannoma most frequently occurs in the gastrointestinal tract (esophagus and stomach) and paraspinal sympathetic chain. Masses can be palpated on abdominal or paraspinal examination.
Causes
CNC is inherited as an autosomal dominant trait, and the genes responsible have been mapped to bands 2p16 and 17q22-24.
- Because the features of CNC, such as the paradoxical responses to endocrine signals, are similar to those of McCune-Albright syndrome and other conditions, the genes implicated in cyclic nucleotide-dependent signaling have been implicated.
- Kirschner and colleagues9 examined families with CNC.
- They first detected a loss of heterozygosity (LOH) in the vicinity of the PRKAR1A gene that encoded the protein kinase A regulatory subunit 1-alpha (R1alpha), which was mapped to chromosome 17q.
- They subsequently identified 3 unrelated kindreds with an identical mutation in the coding region of PRKAR1A.
- An analysis of PRKAR1A activity demonstrated that basal activity is decreased and cAMP-stimulated activity is increased in CNC tumors compared with non-CNC tumors.
- Kirschner et al concluded from these findings that germline mutations in PRKAR1A, an apparent tumor suppressor gene, are responsible for the CNC phenotype in a subset of patients with this disease.
- Kirschner et al10 also screened the mutations present in 54 CNC kindreds.
- In 14 of the mutations that were mapped to the PRKAR1A locus, they found a premature stop codon; one altered the initiator ATG codon.
- The messenger RNAs (mRNAs) resulting from this mutation were unstable, and they rapidly decayed.
- The PRKAR1A products were absent in the affected cells.
- These studies were the first to show a disease with mutations in the protein kinase A holoenzymes, critical components of the signaling pathway.
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Further Reading
Keywords
CNC, CNC type I, CNC type II, Carney complex, Carney's complex, Carney's syndrome, Carney myxoma-endocrine complex, lentigines, blue nevi syndrome, LAMB syndrome, nevi, atrial myxoma, myxoid neurofibromata, ephelides, NAME syndrome, complex of myxomas, spotty pigmentation, endocrine overactivity, multiple neoplasia and lentiginosis syndrome, primary pigmented nodular adrenocortical disease, PPNAD, hypercortisolism, nonendocrine tumors, endocrine tumors, PRKAR1A
Overview: Carney Syndrome