Which clinical manifestation is expected in a child with acute renal failure?

In the context of acute renal failure in children, the presence of edema is a significant clinical manifestation. Acute renal failure, also known as acute kidney injury, often leads to the retention of fluids and waste products in the body due to the kidneys' impaired ability to filter and excrete them. As a result, excess fluid can accumulate in the tissues, leading to swelling, or edema, particularly in areas such as the legs, ankles, and around the eyes. This retention is often due to imbalances in fluid regulation and the body's inability to excrete sodium and water effectively.

The other options do not typically correlate directly with acute renal failure. Hyperactivity is not a common symptom and may actually indicate a different set of issues, while fever is more associated with infections than with renal failure specifically. Weight loss may occur over a more extended period due to chronic conditions or malnutrition rather than being a clear indicator of acute renal failure, where there is often more fluid retention than loss at the onset. Therefore, the identification of edema as a manifestation of acute renal failure aligns well with the physiological changes occurring in the child's body when kidney function is compromised.