CTICasesSubcarinal Bronchogenic Cyst
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Imaging findings
Chest radiographs show a classic well-defined, rounded subcarinal mass causing extrinsic compression on adjacent mediastinal structures. Computed tomography confirms a large, homogeneous, non-enhancing subcarinal cystic lesion with slightly elevated CT attenuation values of approximately 22 Hounsfield Units, consistent with highly proteinaceous or mucoid internal fluid.
Key takeaways
Bronchogenic cysts are congenital foregut malformations most frequently located in the subcarinal region of the mediastinum. Although they are fluid-filled structures, their attenuation values on computed tomography often exceed simple water density due to high proteinaceous or calcium oxalate content, which can mimic a solid soft-tissue mass and sometimes requires magnetic resonance imaging to confirm its cystic nature.
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