My last little man had the same thing show up at 19 weeks. His was bilateral though. Measurements were the same as yours from memory.
My understanding was that this can be a fairly common finding, which often resolves during the rest of the pregnancy. You're right, another ultrasound is performed. We had a repeat one done at 30 weeks which showed everything looked normal. So don't worry!
I think they used to give antibiotics to some of the babies who showed this in utero, but apparently recent studies in the last few years shows that this is probably not needed. Sometimes they might also like to do an ultrasound after the baby has been born to check again, but if the problem seems to have resolved there's no real need to do that either. Just keep an eye out for any signs of an infection etc.
Our paed decided initially there was no need to do an ultrasound after he was born, but we ended up having one a few weeks ago only because our fella has another health problem and has been having everything checked out.
I'm sure everything will be all fine with your little one. All the best!
Mummy2one, I have no advice on the fetal side of renal pelvis dilatation but my DS does have the condition. It was initially picked up when he contracting an UTI not long after being discharged from SCN and was readmitted due to the severity of the UTI.
His left renal pelvis measures 3.9mm and right 1.6mm. The measurement and UTI were initial flags that he may have renal reflux or a blockage but tests confirmed that this was not the case. His paediatrician is not at all concerned as the measurement is not more than 10mm. He does have an u/s every 6 months to confirm that there is no increase in size. I have been advised that a decrease in size is expected (in the majority of cases) as the issue usually resolves itself with time.
Hun, I know it's difficult not to worry but bear in mind the majority of cases do resolve themselves in utero or shortly after birth and there is treatment if reflux or blockage is found to be the cause.
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Hun, I know it's difficult not to worry but bear in mind the majority of cases do resolve themselves in utero or shortly after birth and there is treatment if reflux or blockage is found to be the cause. 
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