A Tale of Two Pathways: Tamsulosin MET Versus Historical Analgesic-Only Therapy for Pediatric Distal Ureteral Stones

Background/Objectives: Distal ureteral stones in children can cause severe colic and may lead to persistent obstruction potentially resulting in renal damage if not treated accordingly. This study assessed whether tamsulosin-based MET is associated with higher spontaneous passage of 4–10 mm distal ureteral stones and a lower need for surgery compared with analgesic therapy alone. Methods: In this single-center prospective observational cohort study with a historical comparator, 270 patients aged 5–18 years presenting with renal/ureteral colic and imaging-confirmed distal ureteral stones (4–10 mm) received tamsulosin-based MET (0.4 mg daily) from 2016 to 2023 and were stratified into three age groups. Follow-up included ultrasonography at days 7, 14, and 21. Outcomes were compared with a historical control cohort (2009–2015), involving 242 patients, treated with analgesics alone under the same criteria, follow-up and indications for surgery. The primary outcome was confirmed spontaneous stone passage during the 21-day conservative pathway, before any decision to operate; secondary outcomes included surgery (decision to proceed to ureteroscopy/laser lithotripsy by day 21) and its timing. Results: Spontaneous passage occurred in 78.5% of patients on MET versus 49.6% on analgesics alone (risk difference 28.9 percentage points, 95% confidence interval [CI] 20.7–36.6; p < 0.001), also after adjustment for stone size and hydronephrosis (adjusted odds ratio 4.52, 95% CI 2.95–6.91). Passage was higher with MET in all age groups (exploratory; treatment-by-age interaction p = 0.390), and surgery was decided in 21.5% versus 50.4%. No adverse effects were reported by parents, but they were not systematically recorded. Conclusions: Tamsulosin-based management was associated with a higher observed rate of spontaneous passage and a lower proportion undergoing ureteroscopy than historical analgesic-only care. These findings require cautious interpretation because of the non-contemporaneous comparison and potential confounding by calendar period, stone characteristics and intervention practices.