A nurse is assessing a 1-year-old toddler notices a large abdominal mass and pink-tinged urine on the diaper. Which of the following disorders should the nurse suspect?

A. Pyloric stenosis usually causes vomiting and dehydration, not an abdominal mass or hematuria. B. Nephritic syndrome may cause hematuria but typically presents with edema and hypertension, not an abdominal mass. C. Wilms' tumor is a common kidney tumor in children and typically presents with a palpable abdominal mass and hematuria (pink-tinged urine). D. Intussusception typically presents with abdominal pain, vomiting, and "currant jelly" stools, not an abdominal mass or hematuria.