Poland syndrome

Poland syndrome (also known as Poland anomaly or Poland sequence) is a rare congenital condition characterized by unilateral absence or underdevelopment of the pectoralis major muscle, typically on the right side, often accompanied by ipsilateral hand and upper limb abnormalities. The condition is present at birth and affects the musculoskeletal system primarily, though it can also involve the chest wall, breast, and occasionally other structures. Key clinical features include partial or complete absence of the sternal head of the pectoralis major muscle, ipsilateral symbrachydactyly (short, webbed fingers), hypoplasia or aplasia of the nipple and areola, absence of other chest wall muscles (pectoralis minor, serratus anterior, latissimus dorsi), and rib defects. The severity is highly variable, ranging from mild pectoral muscle hypoplasia to significant chest wall deformity with hand malformations. The condition occurs more frequently in males than females, with an approximate male-to-female ratio of 3:1, and the right side is affected in about 75% of cases. Although the exact cause remains unclear, the most widely accepted theory involves disruption of blood flow through the subclavian artery or its branches during early embryonic development (around the sixth week of gestation), leading to underdevelopment of structures supplied by these vessels. Most cases are sporadic, though rare familial occurrences have been reported. Treatment for Poland syndrome is primarily surgical and is tailored to the individual's specific manifestations and functional or cosmetic concerns. Reconstructive options include chest wall reconstruction using autologous tissue flaps (such as latissimus dorsi transfer), custom implants, or fat grafting to address the chest asymmetry. Breast reconstruction may be performed in affected females. Hand abnormalities may require surgical intervention to improve function. Physical therapy can also be beneficial. While Poland syndrome is not life-threatening, it can have significant psychosocial impact, and a multidisciplinary approach involving plastic surgeons, orthopedic surgeons, and psychologists is often recommended.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Common questions about Poland syndrome