Benjamin Wedro, MD, FACEP, FAAEM
Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.
Charles Patrick Davis, MD, PhD
Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.
In this Article
- Hydronephrosis facts
- What is hydronephrosis?
- What causes hydronephrosis?
- What are the symptoms of hydronephrosis?
- When should I seek medical care for hydronephrosis?
- How is hydronephrosis diagnosed?
- What is the treatment for hydronephrosis?
- What are the complications of hydronephrosis?
- Can hydronephrosis be prevented?
What causes hydronephrosis?
There are numerous causes of hydronephrosis that are categorized based upon the location of the swelling and whether the cause is intrinsic (located within the urinary collecting system), extrinsic (outside of the collecting system) or if it due to an alteration in function.
Examples of intrinsic causes of hydronephrosis
- Kidney stone. Likely the most common reason to have unilateral hydronephrosis is a kidney stone that causes obstruction of the ureter. The stone gradually moves from the kidney into the bladder but if it should act like a dam while in the ureter, urine will back up and cause the kidney to swell. This would be classified as an intrinsic obstruction.
- Blood clot
- Stricture or scarring
- The inability to empty the bladder (urinary retention) for any reason may cause bilateral hydronephrosis.
- Urethral stricture
- Urethral valves
Examples of extrinsic causes of hydronephrosis
- Tumors or cancers that compress the ureter and prevent urine flow. Examples include lymphoma and sarcoma, especially if they are located in the retroperitoneum, where the kidneys and ureters are located behind the sac that contains the bowel.
- Retroperitoneal fibrosis
- Ovarian vein syndrome
- Cancer of the cervix
- Cancer of the prostate
- Uterine prolapse
- Scarring due to radiation therapy
- Prostate hypertrophy or swelling is a common cause of urinary retention and subsequent hydronephrosis in males.
- Prostate cancer
Examples of functional causes of hydronephrosis
- Neurogenic bladder or the inability of the bladder to function properly occurs because of damage to the nerves that supply it. This may occur in brain tumors, spinal cord injuries or tumors, multiple sclerosis, and diabetes among other causes.
- Vesicoureteral reflux where urine flows backwards from the bladder into the ureter. Prenatal hydronephrosis is an example, though it may occur at any time in life.
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