Horner’s syndrome after an ultrasound-guided fine-needle aspiration puncture of a thyroid nodule

Horner's syndrome is a potential complication of diagnostic and therapeutic procedures directed at the thyroid gland, including ultrasound-guided fine-needle aspiration. It is characterized by eyelid ptosis, miosis, enophthalmos and anhidrosis homolateral to the lesion. The diagnosis of Horner's syndrome is clinical after excluding structural causes and establishing the temporal relationship between the procedure and the manifestations. There is no targeted treatment for Horner's syndrome, but it can be prevented.