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Figure 7b. Postoperative spiral CT angiography (2-mm collimation, pitch of 2, 24% iodinated contrast agent) performed in a 72-year-old patient treated by means of left pneumonectomy for lung carcinoma. (a) Spiral CT scan obtained at the level of the left pulmonary artery stump shows an endoluminal filling defect (arrowhead). (b) Spiral CT scan obtained at the level of the bronchus intermedius. Note the additional presence of a partial filling defect (arrow) at the level of a subsegmental branch of the anterior segmental artery of the right upper lobe.