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What is fetal hydronephrosis?

Aug 27, 2023 Source: Cainiu Health
Dr. Zhao Xiaodong
Introduction
In general, fetal pyelectasis may be caused by factors such as urinary tract obstruction, renal hypoplasia, posterior urethral valves, retroperitoneal urinoma, or failure of closure at the ureteropelvic junction. Patients should promptly seek medical attention at a正规 hospital for timely diagnosis and appropriate treatment. Fetal pyelectasis is a common fetal urinary system abnormality characterized by fluid accumulation in the renal pelvis.

Fetal pyelectasis is generally caused by factors such as urinary tract obstruction, renal hypoplasia, posterior urethral valves, retroperitoneal urinomas, or failure of closure at the ureteropelvic junction. Patients should promptly seek medical attention at a正规 hospital for appropriate diagnosis and treatment. Specific causes are analyzed as follows:

1. Urinary Tract Obstruction

Fetal pyelectasis is a common fetal urinary system abnormality characterized by fluid accumulation in the renal pelvis. Urinary tract obstruction may occur in the ureter, bladder, or urethra, leading to pyelectasis. In mild cases, regular monitoring of the degree of pyelectasis is recommended. For severe cases, surgical intervention may be advised under medical guidance.

2. Renal Hypoplasia

If renal hypoplasia is present, it may easily cause narrowing at the junction between the renal pelvis and ureter, resulting in hydronephrosis. Treatment options include surgical intervention aimed at widening the narrowed segment to facilitate normal urine drainage.

3. Posterior Urethral Valves

Posterior urethral valves commonly occur in male infants. The valve is typically located at the distal end of the prostatic urethra and consists of mucosal folds forming a thin membrane-like structure. During urination, the valve can cause varying degrees of obstruction. The standard treatment is surgical removal of the posterior urethral valve to restore normal urine flow.

4. Retroperitoneal Urinoma

Cysts or tumors in the retroperitoneal region of the fetus may compress the ureters and kidneys, leading to pyelectasis. Treatment usually involves surgical excision of the cyst or tumor.

5. Failure of Closure at the Ureteropelvic Junction

This is a congenital anomaly in which the connection between the renal pelvis and ureter fails to close completely, allowing urine to reflux from the ureter back into the renal pelvis, causing pyelectasis. The typical treatment is surgical repair of the junction to restore normal urine drainage.

When this condition occurs, immediate medical consultation is recommended to avoid delays in treatment.


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