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Noncontrast computed tomography (CT) is the usual first-line imaging procedure for patients with suspected ureteral stones. Follow-up imaging is sometimes required for patients who are managed noninvasively — for example, when we're unsure whether the stone has passed. In this study, New Zealand radiologists assessed whether follow-up ultrasound can detect distal ureteral stones accurately.
The cohort consisted of 152 adults with acute ureteral colic who underwent CT and had stones near the ureterovesical junction (UVJ). One month later, all patients underwent both ultrasound of the distal ureter and either CT (in 92 patients) or plain radiography (in 60 patients). Ultrasound examinations were technically adequate in 143 cases and identified…