hi im 40years old and lost my right kidney when i was four i habve had lots of urine infectiond since ,for the past 12 month i have had bad pain in my other kidney ,i was sent for a scan 3 months ago and they found a 4mm mass,i have been back today for a follow up and there was no change i am still suffering for pain in my kidney area and lost lots of weight and appetite ,do you think the mass could be serious and are all the symptoms connected