Fig. 4

Full-thickness section cut parallel to the surface of a discoid lateral meniscus in a 17-year old patient (20× Masson’s trichrome). Tissue with areas characterized by a marked alteration of the extracellular matrix density clearly highlighted by a non-homogeneous intensity of staining. In these areas, the collagen fibers showed an undefined arrangement, with a loose texture. A drastic reduction or a completely absence of the cellular component was also observed