Spontaneous Passage of Female Ureteral Stones and Evidence‑Based Management
Stone Size and Passage Probability
- In females, ureteral stones ≤5 mm pass spontaneously in 75‑89 % of cases, with the highest rates for distal ureteral stones. (European Association of Urology) 1
- Stones >10 mm pass spontaneously in ≤25 % of cases and therefore usually require medical expulsive therapy or definitive surgical intervention. (European Association of Urology) 1
Stone Location Impact
- Distal ureteral stones achieve an overall passage rate of 68‑83 %, rising to ≈89 % when the stone is ≤5 mm. (European Association of Urology) 2
- Mid‑ureteral stones have a passage rate of 58‑70 %. (European Association of Urology) 2
- Proximal ureteral stones pass in 49‑52 % of cases. (European Association of Urology) 2
Expected Timeline for Spontaneous Passage
- When a stone does pass spontaneously, the average time to passage is 17‑24 days (range 6‑29 days). (European Association of Urology) 1
Medical Expulsive Therapy (MET)
- Alpha‑adrenergic blockers (tamsulosin, alfuzosin, doxazosin, terazosin, or silodosin) should be offered for ≈30 days to patients with distal ureteral stones ≤10 mm to facilitate passage, lessen pain episodes, and reduce unplanned healthcare encounters. Strong recommendation, Grade A based on meta‑analyses of >8,000 patients. (American Urological Association) 3
- For mid‑ or proximal ureteral stones ≤10 mm, MET may be considered, but the supporting evidence is less robust. (American Urological Association) 3
Clinical Management Algorithm
- Stones ≤5 mm: Recommend conservative management with MET for 30 days; expected passage >75 %. (European Association of Urology) 1
- Stones 5‑10 mm: Offer MET with close follow‑up; proceed to surgical intervention (ureteroscopy or shock‑wave lithotripsy) if no passage by 30‑40 days or if complications arise. (American Urological Association; European Association of Urology) [3][1]
- Stones >10 mm: Advise definitive surgical treatment (ureteroscopy or shock‑wave lithotripsy) as spontaneous passage is unlikely. (American Urological Association) 3