An uncommon case of concurrent tumors: Unilateral Wilm’s tumor with contralateral retroperitoneal teratoma in a 3-year-old child

Key Points

• This case aims to highlight the uncommon occurrence of Wilms tumor and retroperitoneal teratoma in a child, along with diagnostic challenges.
• Patient presented with a right-sided Wilms tumor and a contralateral retroperitoneal mass analyzed via imaging and biopsy.
• Preoperative chemotherapy was administered, resulting in regression of the renal lesion and stability of the retroperitoneal mass.
• Surgical resection confirmed diagnosis and examined tumor histology.
• Surgical resection revealed residual high-risk Wilms tumor on the right side and mature cystic teratoma on the contralateral side.
• The renal lesion regressed with chemotherapy while the retroperitoneal mass remained stable.
• Findings underscore the necessity for interdisciplinary approach and tailored therapy for optimal outcomes.