CTICasesMediastinal Thymic Cyst
Imaging findings
Frontal chest radiograph shows subtle leftward displacement of the aortopulmonary window interface. Non-contrast chest CT demonstrates a well-circumscribed, uniformly low-attenuation (15-20 HU) anterior mediastinal mass with slightly lobular contours and no visible solid tissue components.
Key takeaways
Thymic cysts can mimic solid anterior mediastinal masses like thymomas on non-contrast CT due to borderline fluid attenuation values. Magnetic resonance imaging (MRI) is highly useful in these cases to confirm the benign cystic nature of the lesion by demonstrating high T2 signal intensity and a lack of contrast enhancement, potentially sparing the patient from unnecessary surgery.
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