Which of the following findings is associated with Wilms tumor?

Wilms tumor, also known as nephroblastoma, is a type of kidney cancer that primarily affects children. One of the hallmark presentations of Wilms tumor is a non-tender abdominal mass. This characteristic finding may be detected during a physical examination or can sometimes be observed by the parents or caregivers of the child. Unlike other abdominal masses that may cause pain due to compression or invasion of surrounding structures, the mass associated with Wilms tumor typically does not cause pain, leading to the description of it as non-tender.

The absence of tenderness distinguishes this condition from other causes of abdominal masses that may involve acute inflammation or irritation of the surrounding tissues. Furthermore, early diagnosis and timely intervention are crucial for managing Wilms tumor effectively, often involving surgery and chemotherapy.

In this context, painful abdominal masses, while indicative of other conditions, would not align with the typical presentation of Wilms tumor. Other symptoms like fever, chills, jaundice, or fatigue may suggest different pathologies or complications but are not directly linked to the classic presentation of Wilms tumor. Hence, the non-tender nature of the mass is a defining characteristic of this childhood cancer.