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肺动脉主干内血栓

肺动脉主干内的血栓栓子近距离外观显示分层结构，这是骨盆或下肢大静脉血栓的特征表现。
A closer view of a thromboembolus filling a main pulmonary artery reveals a layered appearance, typical of a thrombus that formed in a large vein of the pelvis or lower extremity.