A 32-year-old man presents to the emergency department with acute onset severe left loin-to-groin colicky pain, nausea, and restlessness. Urinalysis shows microscopic haematuria. A non-contrast CT KUB (low-dose stone protocol) is performed. The structure marked **A** in the diagram shows a hyperdense ureteric calculus measuring 8 mm with Hounsfield density of 480 HU. Which of the following is the most appropriate initial management strategy for this patient?
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