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Since 1985, counseling for fetal renal pelvic dilatation has been done to determine whether there is need for newborn urological evaluation. This is likely if the anteroposterior width of the renal pelvis exceeds categorical cutoffs, ie 4 mm or greater before gestational age 33 weeks, or 7 mm or greater after 33 weeks. Cases below these categorical cutoffs are deemed not to merit newborn testing....
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