Hi, Thanks for writing in. The stone was probably detected in the pelvic ureteric junction and measures 3.5 mm. Subsequently with drinking lots of water, the stone at renal pelvis has been flushed into the ureter. As it wen downwards, the stone got caught in the vesicoureteric junction. Even in this location the stone can cause significant pain and discomfort. There can also be proximal hydroureteronephrosis. On drinking adequate water this stone will be expelled in to the urinary bladder lumen and make its way out through the penile urethra. A cyst measuring 23 mm in diameter is not significant and can be left alone. Only cysts more than 30 mm in diameter are screened for increase in size by repeat ultrasound scan after 3 to 6 months.