CTICasesLarge mediastinal thymic cyst
Imaging findings
CT scan shows a massive, homogeneous, fluid-attenuating mediastinal cyst filling the right hemithorax and causing leftward tracheal deviation, showing a fibrous capsule and no distinct epithelial lining.
Key takeaways
Thymic cysts are benign lesions that can grow very large and become highly adherent to adjacent mediastinal structures. Histology may show a fibrous capsule without epithelial lining in long-standing cases, making differentiation from other mediastinal cysts difficult.
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