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 –
Neuroblastoma
Wilm's tumor
Medulloblastoma
Pheochromocytoma
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