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. 2020 Sep 29;21:188. doi: 10.1186/s12881-020-01131-w

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Cryosections of the left deltoid muscle biopsy specimen, frozen in isopentane cooled in liquid nitrogen were used for routine histological staining and histochemical techniques. Hematoxylin and Eosin (HE 200x, panel a), Gomori trichrome (GT 200x, panel b) and Periodic Acid Schiff (PAS 200x, panel c) staining revealed unspecific minimal myopathic changes with mild variation in the fiber size and rare atrophic, angulated fibers. On reduced nicotinamide adenine dinucleotide tetrazolium reductase (NADH-TR 200x, panel D and 400x, panel e) unevenness of stain and multiple core-like areas devoid of enzyme activity in both fiber types, but mainly in type I fibers were identified. A nonspecific predominance of type I fibers (dark color) was highlighted by adenosine triphosphatase staining (ATPase pH 4,35,100x, panel f)