Hi. The mean dimensions of the kidneys upon maturation are: length-about 12cm, breadth-about 6cm and thickness-about 3cm. The weight of one kidney averages about 120-150 g. Any decrease in size is abnormal. Prominence of the pelvocalyceal system means that maybe because of distal blocking ( probably due to a stone )there is collection in the pelvocalyceal system and hence the CT scan
of the kidney, ureters and bladder is suggested. This is a more precise form of investigation. The urine forms in the kidneys and flows into the bladder through the ureters. Any blockage in the ureters will cause accumulation of urine in the kidneys. Hope this helps you.