My usg says " pelvicalyceal fullness in left kidney/'. what does it mean?

Here are some...: Without clinical symptoms and history, fairly speaking, a professional could not deduce a clinically relevant diagnosis from the one-time finding of pelvicalyceal fullness in left kidney, although possible mild long-term functional "obstruction at the upper part of ureter needs to be considered. So, ask and discuss this finding with your doctor so to reach reasonable possible explanation. Best...