Introduction

Carney complex

The Carney complex is a rare genetic disorder in which the colour of skin changes around the eyes, lips, and private parts. They become black and dark brown spots called lentigines. It is the growth of a noncancerous tumour in connective tissue or a hormonal gland. The symptoms of Carney complex appear in early childhood.

Involvement of the endocrine system in carney complex

The endocrine system is involved in almost all of the body's metabolism. The four most important glands involved in the Carney complex are the thyroid, pituitary, adrenal, testes, and ovaries.

• The small lumps made in the adrenal gland, called PPNAD (adrenal tumour), produce too much cortisol, leading to Cushing's syndrome
• The lumps in the pituitary gland produce too many growth hormones, which lead to acromegaly (big hands and feet)
• The lumps that form in the thyroid gland may sometimes change into cancers and affect different body functions
• The lumps in the testes and ovaries disturb fertility. In males, early puberty and infertility, and in females, disturbances in the menstrual cycle, hormonal balance, and infertility

Importance of this article

The importance of this article is to educate people about this rare disorder because more than 50% of people are unaware of this syndrome. Due to early detection, the person's life will be saved by the helpful medical adviser.

Some people think that when there are lumps in the body, it is normal. In some cases, it is normal and cannot grow into a tumour, but in some cases, it grows into a cancerous cell. This article helps determine which sign is harmful and which is normal.

Understanding carney complex

Definition

The Carney complex is caused by a genetic mutation in a gene that makes the spot on the skin and forms non-cancerous tumours, affects the endocrine system, and leads to other syndromes such as Cushing syndrome.

 It is also known by different names, such as

1. Carney syndrome is commonly used
2. NAME means nevi, atrial myxoma, myxoid neurofibromas, and ephelides syndrome
3. LAMB means lentigines, atrial myxoma, and blue nevi syndrome

This highlights the spots and parts that are commonly affected by this disease.

Background

The Carney complex was first discovered by J. Aidan Carney in 1985. It happens due to the change in genes and chromosomes, which includes the PRKAR1A, PDE11A, and PDE8B genes and the 2p16 chromosome.

Less than 75 cases were reported in the world, according to the WHO in 2022, which were detected in the early 20s. 60% to 70% of patients with Carney complex have Cushing syndrome. Most females and young adults can be affected by this syndrome.

Genetic basis and epidemiology

The main gene that causes the Carney complex is PRKAR1A. This gene is responsible for instructing the enzymes to make the protein kinase A, which is responsible for controlling cell growth and division. When there is a mutation in the PRKAR1A gene, the control of cell growth and division is disrupted. They grow and divide cells in large numbers and make a tumour. About 80% of cases of Carney complex come with a mutation in the PRKAR1A gene.

Also, other genes are included in this syndrome, such as PDE11A and PDE8B, which are included in 20% of cases of Carney complex. These genes are responsible for conducting the message in the body.

On the other hand, chromosomes are also included in this, such as Chromosome 2p16 2.

Inheritance pattern

The carney complex is transferred from parent to offspring. It is an autosomal disease in which if one parent is affected by this syndrome, there is a 50% chance that the offspring will get this syndrome.

In the world, around 70% of patients come from the autosomal way, and the remaining 30% is a de novo mutation (new mutation); when a zygote develops, it develops with some mutation.

Cushing syndrome in carney complex

Role of primary pigmented nodular adrenocortical disease

The Carney Complex leads to Cushing's syndrome; when it produces lumps in the thyroid gland, it becomes primary pigmented nodular adrenocortical disease (PPNAD). and produce too much cortisol. This condition leads to Cushing syndrome.

Clinical presentation of Cushing syndrome in CNC

• Fatty hump between the shoulders 
• Round face 
• Pink and purple stretch marks on the skin 
• High blood pressure
• Sometimes leads to type 2 diabetes.

Diagnosis and hormonal assessments

The different tests and hormonal assessment can be done to check the Cushing syndrome, such as:

• 24-hour urinary cortisol test
• Cortisol level test 
• Low and high dose dexamethasone suppression test
• ACTH levels test 
• CT scan and MRI of abdomen, pituitary and chest.

Treatment options and prognosis

Treated by

• Chemotherapy
• Radiation
• Medication
• surgery

Thyroid abnormalities in carney complex

Common thyroid findings

The Carney complex made the lumps in different body parts. When it makes lumps in the thyroid region. It changes into multiple thyroid nodules and benign adenomas, and sometimes it changes into thyroid carcinomas.

Risk of malignancy

Risk of malignancy means the abnormal growth of cells, which leads to tumours and cancer. The risk of thyroid malignancy is low but present, such as 1% to 3%. It produces papillary or follicular thyroid carcinoma.

Diagnostic approaches

It can be diagnosed by

• Imaging process
• Biopsy
• Thyroid assessment
• Hormonal checking

Endocrine manifestation

Pituitary

Extra cells make extra growth hormones, which cause acromegaly.

Testes

Male effect by this causes the large cell calcifying Sertoli cell tumour. Usually, in both tests, there are causes of infertility problems.

Ovaries

First, the cysts and lump-like structures form around the private part, and later they lead to cancer.

Cysts or benign tumours occur in many women (~60%). Rarely turn into cancer, usually later in life.

Non-endocrine manifestations

Cardiac myxomas

Lumps in the heart that are present in the heart of a Carney complex patient. may cause a stroke and lead to a heart attack.

Lentiginosis, blue nevi, and cutaneous myxoma

Different colour spots on different parts of the body in the Carney complex patient's body.

Breast lumps

It includes lobular or nodular myxomatosis, myxoid fibroadenomas, or ductal adenomas.

Melanotic schwannoma

Looks like melanoma and acts as a schwannoma. Usually found in the GI Tract and paraspinal area. Rarely, but spreads into the lungs, liver and brain

Osteochondromyxoma

Rarely appear—bones with a painless mass, such as the nasal bone. 

Other lesions

Rarely does it include liver cancer, pancreatic tumours, or brain aneurysms.

Treatment strategies

Endocrine-specific management

Remove the affected gland if it is needed because it may harm its surrounding cells.

Surveillance

Examine the whole body after a certain period of time to recover easily from the disease.

Multidisciplinary approach

A panel of medical professionals work together to recover from this condition quickly.

Conclusion

The Carney complex is a rare genetic disorder which is caused by a mutation in genes on some chromosomes. It affects the hormones and disturbs the endocrine system, leading to various diseases such as Cushing's syndrome and thyroid nodules. Before, they were unaware of this syndrome because of a lack of knowledge. Early diagnosis saves lives because it sometimes leads to cancer.