Hi, my dad had an operation in 1994. He had stones in kidney. For that he had an operation in which the doctors took the stones out and put a pipe in it. (i have no idea exactly where they had placed the pipe) They had asked my dad to take the pipe out after 6 months. But being a careless guy he didn't took it out till today. Recently he had an x-ray and found out there is a bigger stone at the end of the pipe causing urine to accumulate hence causing infection. Doctors are saying its critical. They are saying he need to go for operation and taking the pipe out is critical as it can break. My mom is tensed. Me too. Can anyone suggest what will be the best option and is there anything to worry. Is it critical or a normal operation.