Presentation
Left renal colic.
Patient Data
Age: 60 years
Gender: Male
From the case:
Twinkling artifact - renal stone
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Info
Left renal stone is seen as an echogenic focus with posterior acoustic shadowing. The colour Doppler shows an alternating colours signal behind the stone giving the appearance of turbulent blood flow in keeping with twinkling artifact. No dilatation of the renal cavities.
The right kidney and urinary bladder were normal (not shown).
Case Discussion
Twinkling artifact is more sensitive for the detection of small stones (e.g. urolithiasis, cholelithiasis) than acoustic shadowing. The presence of renal twinkling artifact on ultrasound exam has a high positive predictive value (78%) for the presence of nephrolithiasis on unenhanced CT.
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