In children older than 2 years, what is the most common intra-abdominal tumor?

In children older than 2 years, Wilms tumor is indeed the most common intra-abdominal tumor. This type of cancer arises from kidney tissues and is typically seen in preschool-aged children, with the peak incidence occurring between ages 2 and 5.

Wilms tumor is not only a common pediatric malignancy but is also characterized by its relatively favorable prognosis compared to other pediatric tumors. The disease often presents as an abdominal mass, and treatment generally includes a combination of surgery and chemotherapy.

While hepatoblastoma can also occur in young children, its peak incidence is typically in children younger than 3 years, making it less prevalent in those over 2 years. Neuroblastoma, although it is the most common extrarenal solid tumor in children, tends to occur primarily in infants and younger children. Germ cell tumors can present as intra-abdominal masses, but they are less common than Wilms tumor in the specified age group.

Overall, the age-defined epidemiology and the typical characteristics of Wilms tumor make it the correct answer in this context.