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What is A 1–year–old child presented with a swelling in the left flank with episodes of flushing, diarrhea, sweating and bone pain. The diagnosis is – and explain in detail?
Clinical manifestations of neuroblastoma 

Because neuroblastoma arises from neural crest derivatives of sympathetic nervous system, it produces catecholamines.
So, it may cause clinical feature due to : --> 1. Primary tumor          2. Metastais          3. Catecholamine secretion