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Fig. 2F —Acute pulmonary embolism (PE) in 78-year-old woman (same patient as shown in Figs. 1A, 1B, 1C, 1D, and 1E). Illustration shows acute PE central filling defect on CT image viewed in long axis of thrombus. Contrast material can be seen on either side of well-defined thrombus forming the "railroad track sign."