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Fig. 2A. —68-year-old woman with high-risk thymoma (type B3 tumor). Enhanced transaxial CT scan (7-mm collimation) obtained at level of aortopulmonary window shows 4.4 x 4.7 cm, round, anterior mediastinal mass with lobulated contour and central dotlike calcification (arrow). This lesion shows heterogeneous enhancement with some area of necrosis (arrowhead).