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Fig. 8 —Chronic pulmonary embolism in 65-year-old man. Curved coronal reformatted CT image viewed on maximum intensity projection shows abrupt vessel narrowing that affects posterior basal segmental artery of right lower lobe. Note abrupt convergence of contrast material, leading to thin column of more distal IV contrast material (arrow). In addition, organized thrombus is identified surrounding column of contrast material (arrowheads).