Figure 1.
a–d. A-69-year-old woman with intimal sarcoma. On fat-suppressed T2-weighted imaging (a), the lesion is seen as a hyperintense columnar filling defect, with irregular proximal margin (red arrow) and the wall eclipsing sign (white arrow) in the main pulmonary artery and the right pulmonary artery. On DWI (b=800 s/mm2) (b), the lesion is hyperintense. On contrast-enhanced MRI (c), the lesion is heterogeneously enhanced. Histopathology (d) shows an abundance of malignant spindle cells with high cellularity and a high nuclear/cytoplasmic ratio (hematoxylin-eosin [HE] staining, ×400).