Final answer:
Wilms tumor is a type of cancer found in the kidneys of children under the age of 5, making the correct answer 'kidneys'. It is essential for prompt medical intervention by specialists for favorable treatment results.
Step-by-step explanation:
Wilms tumor is most commonly seen in the kidneys of children younger than 5 years of age.
Wilms tumor, also known as nephroblastoma, is a type of cancer that typically occurs in one or both of the kidneys. It is the most common form of kidney cancer in children. This tumor originates from primitive kidney cells that can multiply rapidly and form a mass.
As children's bodies are still developing, the cells are more susceptible to mutations that could lead to such conditions. The kidneys are part of the five vital organs that are critical for survival, along with the heart, brain, liver, and lungs. Hence, early detection and treatment are crucial for a better prognosis.
It's important for the child to be evaluated and treated by a healthcare provider who specializes in pediatric oncology to ensure the best possible outcome when dealing with such a serious condition.