Figure 1b. Thymic carcinoid tumor. (a) CT pulmonary angiogram shows a large, partially enhancing anterior mediastinal mass (arrow) that subsequently was diagnosed as a thymic carcinoid tumor on the basis of biopsy results. (b) Axial contrast-enhanced CT image, obtained in a patient with a preexisting diagnosis of thymic carcinoid tumor, depicts metastatic mediastinal, pericardiac, and pleural deposits (arrows).