<s>[INST] hi. my brother got severe pain in kidney on left side. after getting some tests done, the doctor said there in MILD FULLNESS ON THE LEFT KIDNEY BUT THERE IS NO STONE. which further test should i get done to get a clear picture of what was the exact reason why he got severe pain in the kidney. [/INST] HelloThanks for query. Your brother had severe pain in left kidney and his ultrasound scan has revealed Mild fullness of left kidney but no stone has been detected anywhere either in kidney or ureter. This picture of mild fullness of the kidney is always seen in a situation when the patient is in agonizing pain due to stone in ureter and which has passed out very recently before doing scanning. You may repeat USG scan after two weeks to rule out presence of stone or to be rest assured about to confirm passage of stone Chat Doctor.  </s>