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(A) Chorangiosis. (B–D) Chronic histiocytic intervillositis images showing a histiocytic infiltrate in the intervillous space. Pictures at 10× (B), 20× (C), 40× (D). The image, inserted in the corner of (D) shows the results of immunohistochemistry for CD68 (red chromogen), a monocyte lineage marker, highlighting the histiocytic nature of the infiltrate.
