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Figure 10b. Spiral CT angiography (2-mm collimation, pitch of 2, 24% iodinated contrast agent) performed in an asymptomatic 75-year-old patient This study was indicated for the evaluation of a right lung nodule incidentally identified on a postoperative chest radiograph. (a) Spiral CT scan obtained at the level of the right middle lobe shows a well-circumscribed enhancing nodule (arrow), corresponding to a false aneurysm of a right middle lobe peripheral artery induced by a Swan-Ganz catheter. (b) Spiral CT scan obtained at the same level after occlusion of a subsegmental branch of the medial segmental artery of the right middle lobe. There is absence of contrast enhancement at the level of the false aneurysm (thick arrow) after successful endovascular treatment (the thin arrow points to the deposited coils).