CTICasesBronchogenic Cyst
Imaging findings
Chest radiograph reveals displacement of the azygoesophageal recess and filling-in of the subcarinal space. Chest CT shows a well-defined, homogeneous, low-attenuation subcarinal mass. Fat-suppressed T2-weighted MRI confirms a fluid-fluid level within the cyst. An esophagram demonstrates fixed, extrinsic compression of the esophagus without direct communication with the lumen.
Key takeaways
Bronchogenic cysts are congenital foregut duplication anomalies that characteristically present as subcarinal masses. Although they may mimic esophageal duplication cysts on imaging, they are typically non-communicating and contain proteinaceous fluid or mucus, which can manifest as a fluid-fluid level on MRI or higher-than-water attenuation on CT.
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