Urinary tract dilatation in utero: classification and clinical applications

Area of Science:

• Pediatric Urology
• Fetal Medicine
• Diagnostic Imaging

Background:

• In utero urinary tract dilatation is a common finding in fetal ultrasounds.
• Accurate classification is crucial for determining the need for postnatal intervention.
• Existing classifications may lack clarity or practical application.

Purpose of the Study:

• To present a novel morphologic classification for in utero urinary tract dilatation.
• To evaluate the utility of this classification in grading hydronephrotic fetal kidneys.
• To correlate hydronephrosis grades with the likelihood of requiring postnatal urologic surgery.

Main Methods:

• A classification system for fetal urinary tract dilatation was developed.
• Ninety-two hydronephrotic fetal kidneys were assessed using ultrasound.
• Kidneys were graded based on the proposed morphologic criteria.

Main Results:

• Grade I dilatation (renal pelvis AP diameter <10 mm) was considered normal.
• Grades II and III represented intermediate hydronephrosis, with nearly 50% requiring postnatal surgery.
• Grades IV and V indicated severe pathology necessitating neonatal corrective surgery.

Conclusions:

• The proposed classification provides a simple and practical method for assessing fetal urinary tract dilatation.
• This grading system can aid in distinguishing normal findings from those requiring intervention.
• It is expected to improve communication and comparison of results in scientific literature.