<prompt> If you are a doctor, please answer the medical questions based on the patients description.my nephew has 7 year old, symptoms is severe pain in back lower portion, he didnt stand or even to sit, doctor say in his abdomen there is some pus formation near to kidney. what is it?this also infect his kidney, what precaution is used. plz suggest me urgently..  <response>: Hello and welcome to Chat Doctor. As a Urologist, i can understand your anxiety. He mustve a surgical opinion. If theres kidney infection, it needs urgent treatment. Do the following tests:1. Urine routine and culture.2. Blood routine, creatinine,RBS, LFT,and platelets.3. Ultrasound-KUB or a ACTIVE is a must. After reports are seen, treatment of kidney infection, if present, is started. If youve any doubts, send the reports to me, as a direct question. Chat Doctor. Manga. 