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Surgical specimens after pulmonary endarterectomy. This postthrombotic scar tissue was “peeled away” from the central pulmonary artery and is laid out here to correspond with the anatomy of the pulmonary arteries (right/left, cranial/caudal), appearing as a kind of cast specimen of the pulmonary arterial tree. Note the reddish thrombus at the bottom of the left-sided specimen (arrowhead)
