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Pulmonary endarterectomy specimens stained with hematoxylin and eosin. A, Neointimal thickening, 18×; B, region of fibrotic chronic thromboembolic pulmonary hypertension clot containing extracellular matrix and spindle-shaped cells, 290×; C, fresh red clot within an area of organized clot, 100×; D, obstructing lesion with areas of recanalization, 170×.
