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Representative microphotographs of type IV foreign material found in patient clot tissue. Different shapes of the type IV foreign material (red arrows) found in the clot tissue retrieved with MT. The foreign material is surrounded with clot tissue, appears to be homogeneous in texture, wormlike or snakelike in shape, and stained lightly. The residual, surface-coating material remains visible (A, black arrows) (A–D, H&E, original magnification ×400).
