Subcarinal air cyst
Subcarinal air cysts refer to small air cyst that can be detected on a CT scan. They are thought to represent small main bronchial diverticula although the former term is preferred 2. They may be associated with chronic airflow limitation.
Patients are asymptomatic and there are often seen on imaging for some other reason.
HRCT - CT chest
They typically have a lobulated margin and can demonstrate ductlike communications between the air cyst and bronchi. Ductlike communications can arise from the posterointerior aspect of the proximal side of main bronchi; They can be either solitary or multiple. The larger subcarinal air cysts tends to be multiloculated.
If there are relevant clinical factors, consider
- a small pneumomediastinum
- 1. Oshiro Y, Murayama S. Subcarinal air cysts: multidetector computed tomographic findings. J Comput Assist Tomogr. 2010;34 (3): 402-5. doi:10.1097/RCT.0b013e3181ccbef8 - Pubmed citation
- 2. Higuchi T, Takahashi N, Shiotani M et-al. Characteristics and CT features of subcarinal air collections/main bronchial diverticula. Eur Radiol. 2010;20 (1): 95-9. doi:10.1007/s00330-009-1526-z - Pubmed citation
- 3. Higuchi T, Takahashi N, Shiotani M et-al. Main bronchial diverticula in the subcarinal region: their relation to airflow limitations. Acta Radiol. 2012;53 (1): 44-8. doi:10.1258/ar.2011.110222 - Pubmed citation
- 4. Sverzellati N, Ingegnoli A, Calabrò E et-al. Bronchial diverticula in smokers on thin-section CT. Eur Radiol. 2010;20 (1): 88-94. doi:10.1007/s00330-009-1515-2 - Pubmed citation