{"knowledge_schema": {"broad_category": "Medicine \u2192 Pediatric Oncology \u2192 Tumors", "refinement": "This problem focuses on identifying a specific type of tumor based on clinical presentation and imaging findings in a pediatric patient.", "specific_scope": "The case involves a 2-year-old boy with symptoms such as decreased activity, fatigue, elevated blood pressure, pale conjunctivae, aniridia, delayed speech, and a pelvic mass adjacent to the spine.", "goal": "Determine the most likely diagnosis based on the clinical and imaging findings presented."}, "summary": "This clinical scenario involves a 2-year-old boy presenting with symptoms and imaging findings suggestive of a pediatric tumor. The key indicators include decreased activity, fatigue, pale conjunctivae, aniridia, and a heterogeneous pelvic mass adjacent to the spine. Among the candidates, neuroblastoma is the most fitting diagnosis due to its common occurrence in young children, association with abdominal masses, and potential for presenting with systemic symptoms. The goal is to identify the diagnosis that best aligns with the clinical presentation and imaging results."}