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Endarterectomized tissues obtained from a chronic thromboembolic pulmonary hypertension (CTEPH) patient undergoing pulmonary thromboendarterectomy (PTE) surgery. The patient had bilateral disease, and the tissues show segmental extension. The areas where tissue samples were taken are labeled as defined in the text: proximal vascular wall tissue, distal vascular tissue, and occluding coagulant material (red-colored tissue).
