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. 2020 Aug 27;10(9):645. doi: 10.3390/diagnostics10090645

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© 2020 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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Below the large or egg-shelled calcifications, clean acoustic shadowing can be observed (A). Partial acoustic shadowing is observed deep to fragmented calcifications resulting from the heterotrophic ossification in rectus femoris muscle (B). Dirty acoustic shadowing can be observed behind the gas bubbles during an US-guided injection (C). Yellow arrow: acoustic shadowing artifact; white arrowhead: gas bubbles; yellow arrowhead: dirty acoustic shadowing; green arrow: needle. SS: supraspinatus tendon; EDC: extensor digitorum communis muscle.