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Plain computed tomography scans showing nodules, bronchiectatic changes in the right upper lobe of the lung and a mass lesion in the anterior mediastinum (white arrow).
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Plain chest CT demonstrated pulmonary nodules and bronchiectatic changes in the right upper lobe of the lung and a mass lesion in the anterior mediastinum (Fig. 1). We initially thought this SVC aneurysm to be a mediastinal tumour based on plain CT scans (Fig. 1).
(A) Contrast-enhanced computed tomography scans showing a small air bubble in the anterior mediastinal lesion (black arrow). (B) The bottom of the anterior mediastinal mass neighbouring the superior vena cava (SVC) is contrasted strongly in the arterial phase and (C) homogeneously to the same extent as the large blood vessel in the equilibrium phase.
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CECT demonstrated an enhanced anterior mediastinal mass connected to SVC and a small air bubble within the mass (Fig. 2). A CECT scan subsequently demonstrated that the mediastinal lesion showed a similar contrast pattern to SVC (Fig. 2B, C). In addition, a small air bubble within the aneurysm was visible on the CECT scan (Fig. 2A). In our case, CECT showed that the bottom of the aneurysm neighbouring the SVC was strongly contrasted in the arterial phase and homogeneously contrasted to the same extent as the large blood vessel in the equilibrium phase (Fig. 2B, C).