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Poland syndrome (named for Alfred Poland, its describer) is a rare (1 in 30,000 live births) congenital deformity of the chest wall. The pectoralis muscle (the musculature of the upper chest and breast area) on the affected side is absent or underdeveloped (hypoplastic). Additionally, the fingers of the hand on the affected side are webbed (syndactyly). Other findings may include underdevelopment of the rib cage and arm, the breast and nipple, and reduced fatty tissue, sweat glands, and hair in the affected area, and scoliosis.
Severity of the deformity varies, and may go unrecognized for years. It is three times more common in boys than girls, and more often affects the right side of the body.