Unilateral hydronephrosis is swelling of one kidney due to a backup of urine.
Causes, incidence, and risk factors
Hydronephrosis is a condition that occurs with a disease. It is not a disease itself. Conditions that are often associated with unilateral hydronephrosis include:
Acute unilateral obstructive uropathy Chronic unilateral obstructive uropathy Vesicoureteric reflux(backflow of urine from bladder to kidney) Nephrolithiasis(kidney stones)
- Hydronephrosis that occurs without a known cause during pregnancy
Unilateral hydronephrosis occurs in approximately 1 in 100 people.