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Arrangement and packing of collagen fibers. Histopathologic image shows the arrangement and packing of collagen fibers around the tumor islands. Arrangement of collagen fibers (a) parallel, (b) haphazard; packing of collagen fibers (c) loose, (d) dense. Asterick = Collagen fibers, Arrow = Tumor island (PSR stain, polarizing microscopy, ×100)
