Orthopaedics Which of the following is not a contributing factor in thoracic outlet syndrome? A Tumor arising from the middle lobe of lung B Malunion of fracture clavicle C Cervico-thoracic scoliosis D Anomalies of the first thoracic rib 💡 Explanation Which of the following is not a contributing factor in thoracic outlet syndrome? ✓ Correct Answer: A. Tumor arising from the middle lobe of lung