[Irreversible Horner's syndrome after bilateral thoracoscopic sympathectomy].

CASE REPORT: A 19 year-old boy who developed a right Horner's syndrome after a bilateral sympathectomy as a treatment for palmoplantar hyperhidrosis.

DISCUSSION: Horner's syndrome is defined by the occurrence of miosis, ptosis and enophthalmos as a result of involvement of sympathetic innervation. This is quite rare, but identification is very important because it may also be an ominous sign secondary to a neoplasm, neurological diseases, or surgery of the sympathetic chain, as in our case.