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Tracheal cartilage in case R09-035. A: The cartilage in the trachea at the level of the thyroid gland is thickened by irregular nodules of cartilage separated by strands of mesenchymal cells. The adjacent tracheal mucosa (arrow) is unremarkable. B: Trabeculae of immature woven bone (arrows) are present within the foci of mesenchymal cell proliferation.
