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Fig. 3A. —Thymic small cell and neuroendocrine carcinoma in 43-year-old man with dyspnea. Enhanced CT scans (7-mm collimation) obtained at levels of aortic (A) and azygos (B) arches, respectively, show 120-mm slightly heterogeneous anterior mediastinal mass with lobulated margin. Left innominate vein was obliterated by tumor invasion. Superior vena cava is seen to contain tumor thrombus (arrow, A) in A and is markedly narrowed and compressed in B. Also note stippled calcification (arrows, B) in tumor on B.