Can ureteral stones cause pain without causing hydronephrosis?

Area of Science:

• Urology
• Radiology
• Medical Imaging

Background:

• Computerized tomography (CT) is the standard for diagnosing ureterolithiasis.
• Ultrasound is a cost-effective, radiation-free alternative for evaluating ureteral colic.
• Understanding hydronephrosis prevalence in ureteral stone patients is crucial for diagnostic strategy.

Purpose of the Study:

• To determine the frequency of hydronephrosis in patients with ureteral stones and renal colic.
• To assess the relationship between stone characteristics and hydronephrosis.
• To inform the diagnostic utility of imaging modalities like ultrasound.

Main Methods:

• Retrospective review of 248 patients diagnosed with ureteral stones via CT scan.
• Analysis of radiology reports for stone size, location, and degree of hydronephrosis.
• Statistical analysis to identify predictors of hydronephrosis.

Main Results:

• 89.1% of patients exhibited hydronephrosis; 10.9% did not.
• Mild hydronephrosis was observed in 70.6% of cases.
• Stone axial diameter and coronal length significantly predicted hydronephrosis degree (p < 0.001).
• Age, gender, and stone location did not correlate with hydronephrosis severity.

Conclusions:

• A significant minority of ureteral stone patients may not present with hydronephrosis.
• Mild hydronephrosis is common, particularly with smaller stones.
• Stone diameter is a key factor in hydronephrosis development, potentially explaining ultrasound's lower sensitivity compared to CT.