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Case report  A case of a 43-year-old woman presenting with acute left flank pain is reported.    Method and result  Point-of-care ultrasound utilizing color Doppler revealed a twinkling artifact at the left ureterovesicular junction, consistent with a ureterovesicular stone. The sonographic findings and significance of the twinkling artifact are described.

Twinkle twinkle little stone: utilizing color Doppler in emergency ultrasound diagnosis of a ureterovesicular stone