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. 2018 Dec 1;10(12):1849. doi: 10.3390/nu10121849

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Transversal ultrasonography (US) scan that shows quadriceps rectus femoris (QRF) muscle echogenicity. (a) Matched healthy control: Category 1 (normal hypoechogenicity), with the central tendon (thick arrow). (b) Category 2 (heterogeneous). (c) Category 3 (fat infiltration). (d) Category 4 (atrophy due to fasciitis and muscle necrosis). QRF: quadriceps rectus femoris (arrows); femur (arrowhead); ST: subcutaneous cellular tissue (dotted line); US: ultrasound.

Transversal ultrasonography (US) scan that shows quadriceps rectus femoris (QRF) muscle echogenicity. (a) Matched healthy control: Category 1 (normal hypoechogenicity), with the central tendon (thick arrow). (b) Category 2 (heterogeneous). (c) Category 3 (fat infiltration). (d) Category 4 (atrophy due to fasciitis and muscle necrosis). QRF: quadriceps rectus femoris (arrows); femur (arrowhead); ST: subcutaneous cellular tissue (dotted line); US: ultrasound.