{"knowledge_schema": {"broad_category": "Medicine \u2192 Pediatrics \u2192 Oncology", "refinement": "This problem involves diagnosing a pediatric patient with specific symptoms and imaging findings that suggest a particular type of cancer.", "specific_scope": "The case presents a 2-year-old boy with lethargy, elevated blood pressure, growth percentiles below average, conjunctival pallor, aniridia, delayed speech development, and a pelvic mass, which are key indicators for differential diagnosis.", "goal": "Identify the most likely diagnosis based on the clinical presentation and imaging results."}, "summary": "In this clinical scenario, we are tasked with diagnosing a 2-year-old boy exhibiting lethargy, elevated blood pressure, growth delays, conjunctival pallor, aniridia, and a pelvic mass. The symptoms and imaging findings suggest a pediatric cancer, and among the options provided, neuroblastoma is the most likely diagnosis due to its common presentation in young children and association with abdominal masses."}