CTICasesMediastinal Thymic Cyst (Companion Case)
Imaging findings
Chest CT reveals a well-defined anterior mediastinal mass with high CT attenuation values (140 HU on a JPEG DICOM, though potentially a display artifact). T2-weighted cardiac MR demonstrates very bright T2 signal, and T1-weighted MR shows elevated signal without contrast enhancement, confirming a non-enhancing, proteinaceous cyst.
Key takeaways
Mediastinal thymic cysts can present with high attenuation on CT, particularly if they contain proteinaceous, gelatinous, or hemorrhagic fluid. MRI is the modality of choice to differentiate these benign fluid-filled structures from solid, enhancing thymic neoplasms.
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