You are asked by one of your colleagues to scan a 22-year-old women who is 18 weeks pregnant.  Her PMH is only significant for ureteral stones.  She presented with fever of 103 F and right flank pain.  Her urinalysis is consistent with a UTI and your colleague suspects pyelonephritis.  He is concerned, however, that this may be a result of an obstructive uropathy due to a ureteral stone based on her PMH.  He asks you to evaluate the patient for the presence of hydronephrosis.

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