Wilms tumor with intravascular tumor thrombus

Area of Science:

• Pediatric Oncology
• Pediatric Surgery
• Vascular Surgery

Background:

• Wilms tumor (WT) is a common pediatric solid tumor with a tendency for vascular invasion.
• Tumor thrombus formation in the renal vein, inferior vena cava, and right atrium occurs in a significant percentage of WT cases.
• Vascular invasion in WT is often asymptomatic and detected via imaging.

Purpose of the Study:

• To review the incidence, diagnosis, and management of Wilms tumor with vascular thrombus.
• To highlight the role of neoadjuvant chemotherapy in managing WT-associated tumor thrombi.
• To emphasize the importance of a multidisciplinary approach for these complex cases.

Main Methods:

• Review of imaging modalities (CT, MRI, Doppler USG) for detecting intravascular tumor thrombus.
• Analysis of treatment strategies, including preoperative chemotherapy and surgical intervention.
• Discussion of factors influencing management decisions, such as thrombus extent and chemotherapy response.

Main Results:

• Doppler USG, CT, and MRI are effective in diagnosing intravascular tumor thrombi in WT.
• Preoperative chemotherapy is effective in reducing thrombus size in most cases, facilitating surgery.
• Neoadjuvant chemotherapy leads to tumor regression in approximately 50% of patients, often avoiding cardiac bypass.

Conclusions:

• Wilms tumor with vascular thrombus requires a multidisciplinary team approach.
• Preoperative chemotherapy is the recommended initial management for most cases of WT with tumor thrombus.
• Careful case-by-case evaluation is crucial for determining the optimal treatment strategy, balancing surgery and chemotherapy.