In a 9‑year‑old boy with bilateral hydronephrosis, a partially obstructed left kidney with preserved function, who is asymptomatic after laparoscopic left pyeloplasty for crossing vessels with a double‑J (DJ) ureteral stent placed, when should the double‑J stent be removed?

Timing of Double-J Stent Removal After Pediatric Pyeloplasty

The double-J stent should be removed 4-6 weeks after laparoscopic pyeloplasty in this asymptomatic 9-year-old boy.

Recommended Timeline

Based on standard pediatric urological practice for post-pyeloplasty stent management, the optimal removal window is 4-6 weeks postoperatively 1. This timeframe allows adequate healing of the ureteropelvic junction anastomosis while minimizing stent-related complications.

Rationale for This Timing

Healing Considerations

• The reconstructed ureteropelvic junction requires approximately 4 weeks to establish adequate healing and patency
• Premature removal risks anastomotic leak or stricture formation
• Extended stenting beyond 6 weeks increases complication risk without additional benefit

Stent-Related Complications to Avoid

Prolonged stenting is associated with several complications that negatively impact quality of life 2:

• Urinary tract infections (2-6% incidence)
• Stent migration (up to 5%)
• Encrustation and stone formation
• Bladder irritation symptoms (urgency, frequency, dysuria)
• Stent obstruction (1-2%)

Pediatric-Specific Factors

In children, stent removal typically requires general anesthesia for cystoscopy, adding to the anesthetic burden 3. Therefore, timing should balance adequate healing against minimizing this additional procedure's impact.

Clinical Monitoring Before Removal

Prior to stent removal at 4-6 weeks, confirm:

• Patient remains asymptomatic (no fever, flank pain, or urinary symptoms)
• No signs of infection (normal urinalysis if obtained)
• Adequate time for anastomotic healing

Alternative Approach: Stent-on-String

Consider using a stent-on-string technique at the time of pyeloplasty 3. This allows office-based removal without requiring a second general anesthetic, which is particularly advantageous in pediatric patients and reduces overall healthcare burden.

Post-Removal Follow-Up

After stent removal, schedule:

• Renal ultrasound at 6 weeks post-removal to assess for hydronephrosis resolution 1
• Diuretic renography at 3-6 months if clinically indicated to confirm improved drainage
• Clinical assessment for recurrent symptoms

Key Pitfalls to Avoid

1. Do not remove earlier than 4 weeks - risks anastomotic complications
2. Do not delay beyond 6-8 weeks without specific indication - increases infection and encrustation risk
3. Do not skip post-removal imaging - early detection of anastomotic failure is critical
4. Ensure proper stent placement was confirmed intraoperatively - rare misplacement can occur 4