[Rare but dangerous foreign body of the external auditory canal: alkaline batteries]

About an observation in a 3 year-old child of the alkaline drum kits in the external acoustic lacunae, the authors underline that they are rare but dangerous. The mechanisms of toxic activity of these piles are exposed, as well as the complications that they engender and the principles of their treatment. The ablation should be carried out as quickly as possible. The excision is usually possible by natural pathways. However, attention should be paid to preventing post-operational stenosis by using gauze and administering careful local treatment.