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Congenital Absence of Pectoralis Muscles

  1. Congenital variations occur more frequently in the pectoralis than in any other of the skeletal muscles
  2. Pectoralis Major and Minor are the most common congenitally absent muscles
  3. Agenesis is often partial and may be part of a syndrome associated with other anomalies- Poland Syndrome
  4. Patients typically present with a flattened chest wall, with hypoplastic ribs and an elevated nipple and may present with unilateral hyper — radioluscence of the lung on a roentgenogram
  5. Diagnosis is often established on Ultrasound and is mainly based on the absence of a muscle belly or tendon

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