[Surgical treatment of proboscis lateralis: apropos of a case]

A case of proboscis lateralis with complete absence of the left half of the nose, replaced by a lateral trunk, is reported. A surgical correction was required. On a first-stage, the length of the mucocutaneous cylinder was sutured to the half nose to perform a functional, well situated nostril. One or a few operations will take place, later, to put the final touches in the nose. They must respect the compromise between the maximal growth of the tissues and the least psychological trauma for the child.