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. 2023 Jan 24;26(2):343–353. doi: 10.1007/s40477-022-00761-5

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Fig. 4 — Bedside ultrasonography on the left calf with necrotizing fasciitis. Anechoic area in superficial soft tissue (*), caused by fat necrosis and suppurative infiltration, with posterior shadowing (broken opposing white arrows), which seems to break the underlying fascia. Subcutaneous tissue appears thick, and hyperechoic due to diffuse inflammatory infiltrate (vertical arrow)—source: Testa et al. with permission