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a–d. A-47-year-old man with organized thrombi, which appear as a columnar filling defect in left pulmonary artery. On fat-suppressed T2-weighted imaging (a), the lesion is isointense. On DWI (b=800 s/mm2) (b), the lesion appears hypointense. On contrast-enhanced image (c), proximal margin of the lesion is smooth (red arrow) and not enhanced. Histopathology (d) demonstrates abundant fibrin without malignant cells (HE staining, ×200).
