Tracheal bronchus is a rarely found congenital bronchial anomaly.
It usually originates from the right lateral wall of the trachea at the
level < 2 cm above the tracheal bifurcation. The patients usually are
asymptomatic, but some may experience recurrent pneumonia, chronic
bronchitis, or bronchiectasis. It is very rare for a malignant tumor to
grow from this aberrant bronchus. There are only four cases of lung
cancer developing from the tracheal bronchus reported in the world
literature, and we present a fifth