Figure 3.

(A) Post-contrast axial CT scan image during pulmonary arterial phase, which shows high soft tissue density lesion in the anterior mediastinum with hounsfiled unit (HU) consistent with clotted blood (HU = 81). Also note the presence of mild left-sided bloody pleural effusion (HU = 45), associated with the underlying collapse of the posterior basal segment of the left lower lobe and a lesser degree of segmental atelectasis of the posterior basal segment of the right lower lobe, all secondary to recent CABG operation. (B) MPR images show narrowing of RVOT secondary to external pressure effect by retrosternal hematoma (arrows).