Tracheal diverticula are usually not cancerous.
Tracheal diverticulum is a sac-like structure formed when the trachea bulges outward from a weak point. It is mostly caused by congenital local defects of the tracheal wall, but it may also be caused by acquired factors such as chronic obstructive pulmonary disease and tracheoesophageal surgery.
The disease usually has no obvious symptoms and is mostly seen incidentally during physical examination and CT examination, which usually does not lead to serious consequences. There are no reports in the literature that tracheal diverticula can become cancerous, so cancer is almost impossible to occur. If unexplained tissue proliferation and localized enlargement are found in the diverticulum during regular follow-up, the possibility of cancer should be suspected, but this risk is very rare in clinical practice.
Therefore, it is very unlikely that tracheal diverticula are cancerous, and regular follow-up is recommended to observe the progression of the disease.