The topic Absence of Pectoralis Muscle (due to Poland Syndrome) you are seeking is a synonym, or alternative name, or is closely related to the medical condition Poland Syndrome.

Quick Summary:

Poland Syndrome is a rare, congenital defect that is characterized by:

• Absence or abnormality of the pectoralis major muscle, a major chest muscle that normally attaches to the upper arm on one side and the breastbone (or sternum) on the other side
• A combination of abnormalities that occur in the hand termed as symbrachydactyly, which includes
  • Brachydactyly or short fingers
  • Vestigial fingers (small and under developed fingers)
  • Syndactyly (where some of the fingers are fused or joined together)
  • Shortened radius and ulna: The bones of the forearm (termed as radius and ulna) may be very short in certain individuals with Poland Syndrome             
• Both the pectoralis muscle and hand abnormalities occur on the same side of the body
• The right side of the body is often affected in this syndrome than the left side (unilateral condition). Abnormality affecting both sides may also be witnessed in very rare cases (bilateral condition)

In short, hand deformity and underdevelopment of the chest, on the same side of the body are the main manifestations of Poland Syndrome.

Other abnormalities that may be present include:

• Absence or under development of other muscles of the chest wall, sides and shoulder
• Other rib cage abnormalities may also be present, which include:
  • Shortened ribs
  • The absence of subcutaneous fat from under the skin, which make the ribs prominent and noticeable
  • Breast and nipple abnormalities may also be observed
  • Underarm hairs are very meagre in quantity and can be abnormally positioned    
• Abnormalities of the internal organs, such as lungs and kidneys, may also be observed in individuals with severe Poland Syndrome. Also, the heart may be located abnormally on the right side of the chest, a condition termed as dextrocardia

The cause of Poland Syndrome is unknown. The treatment provided is mostly through reconstructive surgeries that are intended to rectify the bone and muscle defects. The prognosis is very good with appropriate surgical intervention and physical therapy.

Please find comprehensive information on Poland Syndrome regarding definition, distribution, risk factors, causes, signs & symptoms, diagnosis, complications, treatment, prevention, prognosis, and additional useful information HERE.