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a, b: Fluid accumulation with air formation over the left iliopsoas muscle that extended into the retroperitoneum, left pelvic cavity and left thigh region.
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C-reactive protein (325 mg/L), hyperlactatemia (46 mg/dL), and acute kidney injury (with an increase in creatinine from 0.94 mg/dL to 1.34 mg/dL). Computed tomography (CT) of the abdomen and lower limbs revealed fluid accumulation over the left iliopsoas muscle that extended into the retroperitoneum, left pelvic cavity, and left thigh region, which suggested an iliopsoas abscess and necrotizing fasciitis (Fig. 1a and b).