Magnetic resonance imaging of cystic thymoma

(A) Axial, balanced steady-state free precession sequence chest magnetic resonance image shows a thick-walled, cystic anterior mediastinal mass (arrow). (B) Sagittal T2-weighted double-inversion recovery fast-spin echo sequence shows a retrosternal mass with a larger, high-signal cystic component (arrow) and a smaller, more caudal, lower signal solid component.