A dilated trachea has numerous causes, and in almost all cases represents tracheomalacia (increased size and increased compliance).
As is almost always the case various diameters have been used. Typical figures include >26mm (in men), >23mm in women or >3cm for both genders.
Although many of the underlying conditions congenital, actual dilatation of the trachea and symptomatic presentation is only later in adulthood. Thus the term congenital in the list below refers to the underlying cause, rather than presence of tracheomegaly at birth.
- cystic fibrosis
- Mounier-Kuhn syndrome (tracheobronchomegaly)
- idiopathic or associated with:
- Marfan syndrome
- Kenny-Caffey syndrome
- Cornelia-de Lange syndrome
- Bruton-type agammaglobulinemia
Acquired tracheomalacia is a common finding, seen in approximately 10% of CT and up to 23% of autopsy and bronchoscopy series 5.
- normal ageing
- prolonged intubation, especially in those with a tracheostomy
- chronic bronchitis
- diffuse pulmonary fibrosis, especially secondary to radiation
- 1. Collins J, Stern EJ. Chest radiology, the essentials. Lippincott Williams & Wilkins. (2007) ISBN:0781763142. Read it at Google Books - Find it at Amazon
- 2. Webb EM, Elicker BM, Webb WR. Using CT to diagnose nonneoplastic tracheal abnormalities: appearance of the tracheal wall. AJR Am J Roentgenol. 2000;174 (5): 1315-21. AJR Am J Roentgenol (full text) - Pubmed citation
- 3. Reeder MM, Felson B. Reeder and Felson's gamuts in radiology, comprehensive lists of roentgen differential diagnosis. Springer Verlag. (2003) ISBN:0387955887. Read it at Google Books - Find it at Amazon
- 4. Brant WE, Helms CA. Fundamentals of diagnostic radiology. Lippincott Williams & Wilkins. (2007) ISBN:0781761352. Read it at Google Books - Find it at Amazon
- 5. Hasegawa I, Boiselle PM, Raptopoulos V et-al. Tracheomalacia incidentally detected on CT pulmonary angiography of patients with suspected pulmonary embolism. AJR Am J Roentgenol. 2003;181 (6): 1505-9. AJR Am J Roentgenol (full text) - Pubmed citation
- 6. Boiselle PM. New Techniques in Cardiothoracic Imaging. Informa HealthCare. (2007) ISBN:0849390192. Read it at Google Books - Find it at Amazon