PMC9979943_01
Right kidney in long-axis with perinephric abscess.
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On the right, a perinephric anechoic fluid collection was seen, no hydronephrosis was present (Figure 1, online Video S1).
Right kidney in long-axis, after drainage of perinephric abscess.
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One day later, repeat ultrasound showed resolution of the anechoic fluid collection (Figure 2).