Poland syndrome facts

- Poland syndrome is a congenital malformation affecting the chest muscle and hand on one side of the body.
- The cause of Poland syndrome is not yet certain.
- The main chest muscle (the pectoralis major) is absent.
- The fingers are webbed on the same side of the body.
- In girls, the breast on that side may be absent.
- Treatment includes reconstructive surgery and possibly implantation of bioengineered tissue.
What is Poland syndrome?
First described by the 19th-century British anatomist Sir Alfred Poland, Poland syndrome is a unique pattern of one-sided malformations that are present at birth (congenital malformations). Poland syndrome is noted for the underdevelopment or absence of the chest (pectoralis) muscles on one side of the body as well as webbing of the fingers (cutaneous syndactyly) on the hand of the same side (ipsilateral side) of the body.
Can Poland syndrome affect either side of the body?
Yes. For reasons not understood, Poland syndrome is twice as likely to involve the right side of the body.
How frequent is Poland syndrome?
The severity of Poland syndrome is variable, and it is possible for mild cases not to be evident until puberty when breast tissue and chest muscle mass development become more obvious. It is felt, therefore, that cases may be misdiagnosed and underreported.
- Experts currently are reporting an incidence of one in 10,000 to one in 100,000 live births.
- For reasons unknown, boys are more likely than girls to have Poland syndrome.
What causes Poland syndrome?
The cause of Poland syndrome is not known. The disorder is currently considered "a nonspecific developmental field defect" occurring at about the sixth week of fetal development.
- Diminished blood flow through the subclavian artery that supplies blood to the arm has been blamed, but final proof for this idea is lacking.
- Speculation has involved two hypotheses.
- One proposes that the underlying ribs on the affected side grow too quickly in a forward growth plane and thus reduce the flow of blood in the arteries leading to the overlying pectoralis muscle and arm on the affected side.
- Another proposal is that a malformation of the embryonic blood vessel serving the pectoralis muscle and arm/hand on that side of the body limits blood flow to these structures.
- To date, no animal research has provided conclusive support for these proposals.
What are the features of Poland syndrome?
While the complete expression of the physical changes associated with Poland syndrome vary among patients, common themes include:
- underdevelopment or absence of the main chest muscle (pectoralis) as well as secondary muscles of the chest and armpit region;
- the end of the pectoralis muscle attachment to the breastbone (sternum) is absent;
- the nipple, areola, and (in females) underlying breast tissues are underdeveloped or absent;
- short and webbed fingers (cutaneous syndactyly) on the affected side; and
- armpit hair on the affected side is missing.
What other defects are associated with Poland syndrome?
The child with Poland syndrome usually is entirely normal except for the problems already noted.
- The skin in the involved area may be abnormally thinned or missing underlying fat normally present beneath the skin.
- Very rarely, the rib cage on the involved side may be underdeveloped or missing.
- Equally rare may be the abnormal development of the shoulder blade (scapula) or bones of the forearm (radius and ulna) on the affected side of the body.
- Spine and kidney malformations are also occasionally reported in patients with Poland syndrome.
- Intelligence is not impaired in Poland syndrome.
Does Poland syndrome run in families?
Geneticists currently hold that Poland syndrome is rarely inherited and generally is a sporadic event.
- There are rare instances where more than one individual has been identified with Poland syndrome either in the immediate or extended family.
- Experience with an affected parent passing the syndrome to offspring has been described.
- Similarly, there are reports in the literature of affected siblings born to unaffected parents.
- The exact mode of genetic transmission has not been determined.
- Research is centering on inherited mechanisms dealing with the intrauterine reduction of blood flow to the affected areas.

SLIDESHOW
Fetal Development Stages: Embryo to Fetus, in Weeks See SlideshowHow is Poland syndrome diagnosed?
When the changes of Poland Syndrome are noted, the diagnosis can be suspected in the newborn period.
- Specialized studies (x-rays, computerized tomography [CT scans]) and
- magnetic resonance imaging (MRI) studies may be utilized to delineate the anatomy of the involved area(s).
Such an understanding is necessary for reconstructive surgery (see below). Mild cases of Poland syndrome may not be apparent until the child has matured or even until puberty. During this time, differences in body development may be more pronounced—especially in female breast development.
How is Poland syndrome treated?
- Reconstructive surgery is the main treatment for those with Poland syndrome.
- Either existing chest muscle or transplanting muscle from another body area may be used to develop symmetry between the affected and unaffected side.
- If chest-wall ribs are underdeveloped or missing, bioengineered cartilage can be implanted to help give the chest a more normal appearance.
- Reconstructive surgery may be considered in males as young as 13 years of age. In females, in order to ensure breast similarity in size and character, reconstructive surgery is often postponed until breast development on the uninvolved side has been completed.
- Therapeutic tattooing can be used to create the appearance of an areola and nipple.
What are the related (alternative) terms?
Other names for Poland syndrome include Poland sequence, Poland anomaly, Poland syndactyly, and absence of the pectoralis muscle with syndactyly.
For more information
Poland's syndrome
This is a dedicated site for patients and families. Information, forums and a support network are provided.
MUMS National Parent-to-Parent Network
"Mums is a parent matching organization that puts parents of children with various conditions in touch with other parents of children with the same condition."
REFERENCE:
Schwartzstein, Richard M., MD. "Diseases of the chest wall." Uptodate. Updated May 29, 2015.
Top Poland Syndrome Related Articles
Breast Anatomy
The breast, or mammary gland is made up of lobules, milk producing glands, and a system of ducts to transport milk. Both males and females have breasts. Abnormal enlargement of breasts in men is referred to as gynecomastia. In women, during pregnancy the breasts grow larger and produce milk. Common medical conditions that affect the breasts include breast cancer, breast lumps, fibrocystic changes and cysts, mastitis, and benign tumors (fibroadenomas).Breast Augmentation and Implants
Breast augmentation refers to the surgical implantation of a silicone or saline implant to give the breast a fuller appearance. Potential complications of the procedure include- infection,
- bleeding,
- asymmetry, and
- hardening of the breast.
Breast Reconstruction
After a mastectomy, breast reconstruction is performed to replace the skin, breast tissue, and the nipple. A patient's goals, medical conditions, cancer treatment, and previous surgery affect the type and timing of the reconstructive surgery.How Long Does It Take to Recover From Breast Reduction?
Following breast reduction, most patients are usually discharged 24-48 hours later. The doctor provides medication and several supportive measures. Most patients can perform routine daily activities on their own after a week and resume light activities two weeks after surgery. Complete recovery after breast reduction usually takes around 8-12 weeks.CT Scan (Computerized Tomography)
A CT scan is an X-ray procedure that combines many X-ray images with the aid of a computer to generate cross-sectional and three-dimensional images of internal organs and structures of the body. A CT scan is a low-risk procedure. Contrast material may be injected into a vein or the spinal fluid to enhance the scan.Chest X-Ray
Chest X-Ray is a type of X-Ray commonly used to detect abnormalities in the lungs. A chest X-ray can also detect some abnormalities in the heart, aorta, and the bones of the thoracic area. A chest X-ray can be used to define abnormalities of the lungs such as excessive fluid (fluid overload or pulmonary edema), fluid around the lung (pleural effusion), pneumonia, bronchitis, asthma, cysts, and cancers.MRI (Magnetic Resonance Imaging Scan)
MRI (or magnetic resonance imaging) scan is a radiology technique which uses magnetism, radio waves, and a computer to produce images of body structures. MRI scanning is painless and does not involve X-ray radiation. Patients with heart pacemakers, metal implants, or metal chips or clips in or around the eyes cannot be scanned with MRI because of the effect of the magnet.Puberty
The time when boys and girls begin the process of sexual maturation is called puberty. During this time, both sexes undergo a series of biological changes that include a rapid increase in height, bone growth, weight increase, the growth of pubic hair, breast development, and the onset of menstruation in girls, and testicle, penis, and muscle enlargement in boys.