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Fig. 2 —36-year-old woman with history of 10 emergency department
evaluations for right renal colic. Transverse CT scan shows 2-mm
nonobstructing stone (arrow) in right kidney. Note absence of signs
of obstruction such as hydronephrosis or perinephric fat stranding. Same stone
was seen in same location on all CT scans. No other cause was ever established
to explain patient's symptoms.
