USMLE Step 2 Quiz
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A 38-year-old woman presents to the emergency department with a fever of 39.2°C (102.6°F), chills, and severe right flank pain. Urinalysis is positive for leukocyte esterase, nitrites, and numerous WBCs. A non-contrast CT scan shows a 9-mm calculus at the right ureteropelvic junction with moderate hydronephrosis.
In addition to intravenous fluid resuscitation and broad-spectrum antibiotics, which of the following is the most urgent intervention?
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