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Figure 10b. Acute pulmonary embolism in a 38-year-old male IV drug user. (a) Pulmonary CT angiogram (window level = 40 HU, window width = 400 HU) shows a filling defect in a right lower lobe pulmonary artery (arrow). (b) CT image shows a small area of pulmonary infarction just beyond the embolus.