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Immunohistochemical analyses showed no detectable staining for WT1 in dermatofibroma (A), spindle cell lipoma (B), nodular fasciitis (C), and solitary fibrous tumor (D). Cytoplasmic staining of blood vessels served as a positive internal control (arrows) (immunoperoxidase; original magnifications 50× (A,D) and 150× (B,C)).
