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Figure 1 Left anterior oblique projections of the ventilation (A) and perfusion (B) images illustrate a perfusion defect in the left upper lobe (thin arrow, B), in Patient 20. This is indicative of a high probability for pulmonary embolus. Coronal (C) and sagittal oblique (D) maximum intensity projections from the computerized tomography pulmonary angiogram are shown. In the coronal projection (C), gradation of vessel contrast from the lower lobe to the upper lobe vessels is seen, and relative paucity of contrast within the upper lobe pulmonary arteries on the left compared to the right is shown near the asterisk. Endoluminal filling defect, in keeping with thrombus, is shown within a segmental upper lobe pulmonary artery (dashed arrow, C and D). Incidental nonocclusive thrombus is also seen in this patient in a lower lobe pulmonary artery (thick arrow, C).
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