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. 2020 Aug 27;2020:3964518. doi: 10.1155/2020/3964518

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Copyright © 2020 J. Raúl Olmos-Zuñiga et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Microphotographs of tracheal scars (Masson's trichrome staining, 2x magnification). (a) Normal histology of the trachea. (b) Group I (control): severe inflammation (I) and disorganized collagen fibres (arrow) around the cartilage (C). (c) Group II (hyaluronic acid), (d) group III (collagen-PVP), (e) group IV (mixture of hyaluronic acid+collagen-PVP), and (f) group V (mitomycin C): well-organized collagen fibres (arrow), mild-to-moderate inflammatory infiltration, and neoformation vessels.