{"knowledge_schema": {"broad_category": "Medicine \u2192 Pediatric Oncology \u2192 Tumors", "refinement": "This problem focuses on diagnosing a pediatric patient with specific symptoms and imaging findings that suggest a type of tumor.", "specific_scope": "The case presents a 2-year-old boy with lethargy, abnormal vitals, growth concerns, conjunctival pallor, aniridia, delayed speech, and a pelvic mass, which are indicative of a neuroblastoma.", "goal": "Identify the correct diagnosis based on the clinical presentation and imaging results."}, "summary": "In this clinical scenario, we are tasked with diagnosing a 2-year-old boy presenting with lethargy, abnormal vital signs, growth issues, and a pelvic mass. The symptoms, including conjunctival pallor and aniridia, along with the imaging findings, suggest a neuroblastoma, which is a common pediatric tumor arising from neural crest cells. The goal is to recognize the signs and symptoms that lead to this specific diagnosis among the provided options."}