Tracheal Tumor A tracheal tumor is an abnormal growth that forms in your trachea, or windpipe. Your trachea carries the air you breathe down into your lungs. It starts just below the level of your larynx (voice box) and ends in your chest, where your airway divides into the two branches called bronchi, which go to your lungs. In an adult, the trachea is about five inches long and about one inch wide. Tracheal tumors can be benign (noncancerous) or malignant (cancerous). In adults, most tracheal tumors a...