The risks here are a guide; your own risk may vary. You should discuss the risks and benefits of surgery with your surgeon, especially if you are worried.
General risks of thoracic surgery apply to tracheal resection.
In addition the following are risks of tracheal resection:
Minor more common risks
A pneumothorax (collapsed lung) may happen, this is treated with a chest drain. Your kidneys may not work as well after surgery but this is usually temporary and gets better with extra fluid.
Major less common risks
The narrowing may come back, the risk of this depends on the cause of the narrowing. Extra tissue (granulations) may grow at the join; bronchoscopy and removal of tissue can be done to treat this.
The nerves to the voice box run along the trachea, care is taken to protect the nerves but they may be damaged. This would cause temporary or permanent voice changes.
The join between the 2 ends of the trachea may break down. This may require further surgery and is the biggest concern at the start of recovery after surgery, this problem may be fatal. Symptoms of breakdown include fevers, difficulty breathing and neck and chest swelling. The risk of death after tracheal resection is 1 in 100, this also means 99 in 100 people recover from the surgery.