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Lesional biopsy showing deep vascular fibrin deposition. H&E stained slides demonstrating a punch biopsy specimen to the depth of the subcutis (A, 10×). Higher power sections showing fibrin deposition in association with deeper small vessels of the dermis and subcutis (B, 40×, and C, 150×). The Van Kossa stain was negative for calcium deposition (D, 100×).
