The condition is called hydronephrosis.
Hydronephrosis is a medical condition characterized by swelling of the kidneys (or one kidney). This happens when urine can't drain from a kidney and retains there as a consequence. The hydronephrosis occurs due to the blockage of ureters or due to reverse flow of urine already in the bladder (reflux). Symptoms include pain in the back, pain during the urination, frequented urination…
