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Fig. 5A. —42-year-old woman with pulmonary arterial occlusion caused by lymphomatoid granulomatosis. T1-weighted MR axial image at level of right main pulmonary artery shows several irregular nodules in peripheral lung parenchyma. Mass or thrombus is noted in right pulmonary artery, extending into lumen of main pulmonary artery (arrow). Descending left pulmonary artery is occluded.