Mushroom intoxication due to Amanita proxima poisoning is characterized by moderate gastrointestinal symptoms, followed by severe acute renal failure and sometimes by hepatic cytolysis. This syndrome was described in the 1990s in the southeast of France; we report here the first pediatric case, requiring dialysis but achieving complete recovery. The mother of this 11-year-old boy, who had eaten the same mushrooms but in smaller quantities, had only biological renal and hepatic involvement.