Fig. 1

Female patient 47 years old presented with dyspnea and chest pain. A, C Axial CT images demonstrate pulmonary embolism near totally occluding the right main pulmonary artery. Also, another smaller PE near totally occluding a segmental branch of the right lower lobe division (arrows). B and D Non contrast axial MR-PA-WB images obtained 48 h later showing the right main pulmonary embolism of hypointense filling defect (arrow) yet partially occluding the lumen. The embolus involving the segmental branch of the right lower lobe division could be demonstrated in non-contrast MRA