N13: Obstructive and reflux uropathy
N13.3: Other and unspecified hydronephrosis
The renal pelvis can become distended if one part of the urinary passages is constricted. The urinary passages consist of the kidneys, the ureters, the bladder and the urethra.
There are normally 2 kidneys in the body. They filter blood and create urine. They thus help to detoxify the body. Furthermore, the kidneys regulate the blood pressure and salt content in the blood, among other things. Each kidney is made up of renal tissue and a renal pelvis. The renal tissue makes up the urine. The urine gathers in the renal pelvis.
The ureter is a thin, muscular tube in the abdomen. There is usually one ureter on each side. The urine flows from the kidney, via the ureter, to the bladder. When you have to pass water, the urine flows from the bladder via the urethra and out.
A part of your urinary passages is constricted. The narrowing of the urinary passages is stopping the urine draining from the kidney properly. If the urine cannot drain from the kidneys properly, it builds up there. This can cause the renal pelvis to expand. The renal tissue around the renal pelvis can also become damaged or smaller.
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The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.
If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.