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Fig. 9 —Contrast-enhanced CT scan of thorax (360° rotation, no cardiac
gating) for evaluation of abnormality of cardiomediastinal silhouette on
standard chest radiograph in 45-year-old man. Cystic tracheobronchial mass
(star) is seen compressing superior vena cava (arrow) and,
on adjacent slices (not shown), displacing right main pulmonary artery
inferiorly and indenting roof of left atrium. Whether cystic lesion is intra-
or extrapericardial is uncertain. Arguments in favor of intrapericardial
nature include origin from region of subaortic pericardial reflections,
whereas two signs arguing against infra- or retrocarinal position are
compression of superior vena cava and inferior displacement of right pulmonary
artery. Mass was subsequently confirmed to be intrapericardial hydatid
cyst.
