Surgeons treating children with unilateral Wilms tumor (WT), the most common primary malignant kidney cancer in children, now have a standardized framework for surgical management thanks to a new expert consensus. The consensus, developed by the Oncology Surgery Group and Urology Surgery Group of the Pediatric Surgery Branch of the Chinese Medical Association, addresses wide variations in practice that can lead to tumor rupture, incomplete staging, recurrence, and unnecessary organ removal. It was published (DOI: 10.1136/wjps-2026-001204) in World Journal of Pediatric Surgery on 17 June 2026.
Although WT outcomes have improved through advances in molecular diagnosis, chemotherapy, radiotherapy, and surgery, surgical management remains inconsistent, especially for large tumors, adjacent-organ invasion, intravascular extension, nephron-sparing surgery (NSS), and lymph node biopsy. Surgeons also come from different specialties, which may contribute to variations in practice. Nonstandard procedures can cause tumor rupture, incomplete staging, recurrence, and iatrogenic progression. Imaging with computed tomography (CT) and magnetic resonance imaging (MRI) helps identify risk features but has limited sensitivity for rupture, and lymph node size on imaging cannot reliably confirm metastasis.
Based on 17 clinical questions, the consensus offers 34 recommendations covering surgical timing, biopsy, incision, renal vessel control, lymph node sampling, tumor thrombus, rupture, recurrence, metastases, NSS, minimally invasive surgery (MIS), horseshoe kidney, special populations, and follow-up. It prioritizes complete local resection, accurate lymph node staging, and histological evaluation while minimizing complications. Immediate radical nephrectomy is recommended for resectable tumors, while preoperative chemotherapy is advised for selected patients with high-risk or initially unresectable disease. Immediate surgery is discouraged in certain circumstances, including confirmed germline WT1 mutation, solitary kidney, severe anesthetic risk, or tumor thrombus above the hepatic veins. Percutaneous biopsy is generally not recommended but is suggested when renal origin is unclear, benign or non-WT disease is suspected, or in stage IV patients and those older than 10 years. A transverse abdominal or thoracoabdominal incision is preferred, and renal pedicle vessels should be ligated early when possible. Adequate lymph node sampling, ideally 6 to 10 nodes from specified sites, improves staging and keeps the false-negative rate below 10%. The ureter should be divided distal to the iliac bifurcation, and the adrenal gland and adjacent organs should be preserved unless directly invaded.
The consensus emphasizes that complete resection and accurate staging remain non-negotiable, yet surgeons must balance oncologic control with renal preservation and avoid unnecessary harm. Multidisciplinary discussion is essential for complex thrombus, recurrent disease, and unusual presentations. Conversion from MIS to open surgery should be viewed as sound judgment rather than failure. The goal is safer surgery, better staging, and fewer avoidable recurrences. The authors call for future studies to refine patient selection for NSS and MIS, improve rupture prediction, standardize lymph node mapping, and clarify anticoagulation and radiotherapy decisions. Ultimately, the consensus aims to support more consistent, individualized care for children with unilateral WT. The framework may also guide referral and multidisciplinary planning in resource-limited settings.
