Is Suspected Transient Pelvicaliectasis Of The Right Kidney A Cause For Concern?

my US KUB findings: normal size and parenchymal echo of both kidneys. Right kidney size is 10.6cm*4.1 cm, cortical thickness is 1.3 cm. Left kidney size is 10.6cm*4.7cm, cortical thickness is 1.4cm. a 0.5 round calcification at mid pole of right kidney. Prominence of right renal sinus. Left pelvicalyceal system is normal. bladder is normally distended with no intravesical lesion. normal prostate gland (volume is 14.24 ml) IMP: a 5mm round calcification at mid pole of right kidney, DDx stone or calcified vessel, suspected transient pelvicaliectasis of right kidney i have done this US two years ago and almost the same findings except this time, the 5mm round calcification which was not found on last US. what is your impression? i have been having dull ache around the flank and on my right side back.. the urologist said this pain had nothing to do with the findings.. i do suffer from IBS