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Figure 1: Aortocoronary saphenous vein graft aneurysm on CT scan of the thorax. Axial CT angiography imaging (to the lower left) and sagittal (to the upper left) and coronal (to the right of the image) CT reconstruction showing a giant mediastinal mass causing compression to the adjacent aortic arch suggestive of a saphenous vein graft aneurysm of 5.5 × 7 cm. A misdiagnosis as a distal aortic arch aneurysm was initially made. The risk of rupture is great

Figure 1: Aortocoronary saphenous vein graft aneurysm on CT scan of the thorax. Axial CT angiography imaging (to the lower left) and sagittal (to the upper left) and coronal (to the right of the image) CT reconstruction showing a giant mediastinal mass causing compression to the adjacent aortic arch suggestive of a saphenous vein graft aneurysm of 5.5 × 7 cm. A misdiagnosis as a distal aortic arch aneurysm was initially made. The risk of rupture is great